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The Spectrum projection package: improvements in estimating mortality, ART needs, PMTCT impact and uncertainty bounds.
Sexually Transmitted Infections. 2008; 84(Suppl 1):i24-i30.The approach to national and global estimates of HIV/AIDS used by UNAIDS starts with estimates of adult HIV prevalence prepared from surveillance data using either the Estimation and Projection Package (EPP) or the Workbook. Time trends of prevalence are transferred to Spectrum to estimate the consequences of the HIV/AIDS epidemic, including the number of people living with HIV, new infections, AIDS deaths, AIDS orphans, treatment needs and the impact of treatment on survival. The UNAIDS Reference Group on Estimates, Modelling and Projections regularly reviews new data and information needs and recommends updates to the methodology and assumptions used in Spectrum. The latest update to Spectrum was used in the 2007 round of global estimates. Several new features have been added to Spectrum in the past two years. The structure of the population was reorganised to track populations by HIV status and treatment status. Mortality estimates were improved by the adoption of new approaches to estimating non-AIDS mortality by single age, and the use of new information on survival with HIV in non-treated cohorts and on the survival of patients on antiretroviral treatment (ART). A more detailed treatment of mother-to-child transmission of HIV now provides more prophylaxis and infant feeding options. New procedures were implemented to estimate the uncertainty around each of the key outputs. The latest update to the Spectrum program is intended to incorporate the latest research findings and provide new outputs needed by national and international planners.
Population and Societies. 2005 Jan; (408):1-4.The United Nations has just published projections of the world population until 2300. The population is expected to increase for fifty years then stabilize… or explode or implode, depending on whether fertility remains durably above or below replacement level. But how much value should we place on projections so far into the future? François Héran explains that this exercise in demography-fiction is useful if it teaches us how to avoid the disaster scenarios of population explosion or implosion. (excerpt)
UN Chronicle. 1997 Fall; 34(3): p..In the middle of 1996, world population stood at 5.77 trillion persons. Between 1990 and 1995, it grew at the rate of 1.48 per cent per annum, with an average of 81 million persons added each year. This is below the 1.72 per cent per annum at which population had keen growing between 1975 and 1990, and much below the 87 million added each year between 1985 and 1990, which now stands as the peak period in the history of world population growth. These figures are from the recently released 1996 Revision of the official United Nations population estimates and projections, prepared by the Population Division of the Department for Economic and Social Information and Policy Analysis. The report indicates that currently 4.59 billion persons--80 per cent of the world's population--live in the less developed regions and 1.18 billion live in the more developed regions. The average annual growth rate is about 1.8 per cent in the less developed and 0.4 per cent in other regions. (excerpt)
World population in 2300. Proceedings of the United Nations Expert Meeting on World Population in 2300, United Nations Headquarters, New York.
New York, New York, United Nations, 2004 Mar 24 x, 36 p. (ESA/P/WP.187/Rev.1)In order to address the technical and substantive challenges posed by the preparation of long-range projections at the national level, the Population Division convened two meetings of experts. The first meeting, the Technical Working Group on Long-Range Population Projections, was held at United Nations Headquarters in New York on 30 June 2003 and provided consultation on the proposed assumptions and methodology for the projection exercise. The second meeting, the Expert Meeting on World Population in 2300, was held at United Nations Headquarters on 9 December 2003. Its purpose was to examine the results of the long-range projections and to discuss lessons learned and policy implications. The Expert Group consisted of 30 invited experts participating in their personal capacity. Also attending were staff members of the Population Division and the Statistics Division, both part of the Department of Economic and Social Affairs of the United Nations Secretariat. This document presents the report of the meeting of the Expert Group on World Population in 2300, along with the background paper prepared by the Population Division and the questions addressed by the meeting. The Population Division drew valuable guidance from the deliberations at the meeting as well as from comments submitted in writing by the experts. All of these inputs will be taken into consideration in preparing the final report on the long-range projections, as well as in future projection exercises. The Population Division extends its appreciation to all the experts for their suggestions and contributions to the preparation of the long-range projections. (excerpt)
Draft report of meeting; [United Nations Interagency Working Group on Demographic Estimates and Projections, tenth session, 12-14 November 1980, Bangkok].
Bangkok, Thailand, United Nations, 1980. 18 p.Add to my documents.
In: United Nations. Department of International Economic and Social Affairs. Population projections: methodology of the United Nations. Papers of the United Nations Ad Hoc Expert Group on Demographic Projections, United Nations Headquarters, 16-19 November 1981. New York, United Nations, 1984. 4-6. (Population Studies No. 83 ST/ESA/SER.A/83)These recommendations refer specifically to the work of the Population Division of the UN and the regional commissions and more generally to the work of the specialized agenices, which prepare projections of labor force and school enroolment. The current recommendations may be regarded as updating an earlier detailed set that was issued by a similar group of experts who convened in New York in November 1977. The recommendations cover general considerations, sources and assumptions, evaluation of projections and their uses, and internal migration and urbanization. The Population Division should consider the question of an optimal time schedule for publishing new estimates and projections in order to avoid unduly long intervals between publications and intervals so short as to cause confusion. The UN Secretariat has an important role in pursuing work on methodology of projections and making it available to demographers in the developing countries. Unique problems of demographic projection exist for those countries with particularly small populations. It is proposed that the Population Division prepare special tabulations, whenever possible, giving the estimated age and sex distribution for these countries. Future publications of population projections prepared by the Population Division should indicate the major data sources on which the projections are based and note if the data were adjusted before inclusion. In addition, some grading of the quality of the base data should be presented. For the UN set of national and international population projections, a more comprehensive system of establishing assumptions about the future trends of fertility is needed. The Secretariat needs to focus more attention on the evaluation of its population projections. UN publications of projections should report on the main errors in recent past projections with respect to estimates of baseline levels and trends and provide some evaluation of the quality of the current estimates. It is recommended that the UN encourage countries to establish a standard definition of urban which would be used for international comparisons but generally not replace current national definitions. The Secretariat should review the techniques currently used to project urban-rural and city populations and search for methodologies appropriate to the level of urbanization and the quality of data which would improve the accuracy of the projections. The Division should regularly produce long range population projections for the world and major countries and should continue and expand its household estimates and projection series, which provides information essential to government administrators and planning agencies, businesses, and researchers in all countries.
The sex and age distributions of population. The 1990 revision of the United Nations global population estimates and projections.
New York, New York, United Nations, 1991. viii, 391 p. (Population Studies No. 122; ST/ESA/SER.A/122)This statistical report includes the estimated and projected age distribution of the population based on high, medium, and low variants for 152 countries with populations greater than 300,000 between 1950 and 2025 in 5-year intervals. A world total as well as by continents and subregions are available along with the spatial groups; least developed countries, less developed regions (excluding China), the Economic Commission for Africa, Latin America and the Caribbean, Asia, and the Pacific, Western Asia, and sub-Saharan Africa. Grouped data reflect countries with populations both greater than and less than 300,000. This revision was begun in 1988 and completed in 1990 by the UN Population Division of the International Economic and Social Affairs Department in conjunction with other UN regional commissions and the Statistical Office. A discussion of methods and data used for these estimates, a summary of findings, and selected demographic indicators will be available in World Population Prospects, 1990, and in summary form in the UN World Population Chart, 1990. A magnetic tape and diskettes of these data are available on request for purchase.
[Unpublished] . 10,  p.Based upon United Nations medium population projections, the population of developing countries will grow from 4,086 million in 1990, to 5,000 million by the year 2000. To meet this medium-level projection, 186 million contraceptive users must be added for a total 567 million in addition to increased contraceptive prevalence of 59% from 51%. This study estimates the number of contraceptive users, acceptors, and cost of contraceptive commodities needed to limit growth to this medium projection. Needs are estimated by country and method for 1990, 1995 and 2000, for medium, high, and low population projections. The number of contraceptive users required to reach replacement fertility is also calculated. Results are based upon the number of women aged 15-49, percent married, number married ages 15-49, and the proportion of couples using contraception. Estimation methodology is discussed in detail. Estimated users of respective methods in millions are 150 sterilizations, 333 IUD insertions, 663 injections, 7,589 cycles of pills, and 30,000 condoms. Estimated commodity costs will grow from $399 million in 1990 to $627 million in 2000, for a total $5.1 billion over the period. Pills will be the most expensive at $1.9 billion, followed by sterilizations at $1.4 billion, condoms $888 million, injectables $594 million, and IUDs $278 million. Estimated costs for commodities purchased in the U.S. show IUDs and condoms to be significantly more expensive, but pills as cheaper. With donors paying for approximately 25% of public sector commodity costs, developing country governments will need to pay $4.2 billion of total costs in the absence of increased commercial/private sector and donor support.
International Family Planning Perspectives. 1991 Sep; 17(3):108-13.South Asia consisting of Bangladesh, India, Nepal Pakistan, and Sri Lanka, claims 1/5 to total world population with expected population growth of at least 200 million by the year 2000. Taking issue with assumptions behind World Bank (WB) and United Nations (UN) population projections for the region, the authors make less optimistic assumptions of country fertility and mortality trends when running population projections for the region. Following discussion of methodological issues for and analysis of population projections, the paper's alternate assumptions and projection results are presented and discussed. Projections were made for each country of the region over the period 1985-2010, based on assumptions that only very modest fertility declines and improvements in life expectancy would develop over most of the 1990s. South Asian population would therefore grow from over 1 billion in 1985, to 1.4 billion by 2000, and almost 1.8 billion by 2010. Overall slower fertility decline than assumed for the UN and WB projections point to larger population growth with momentum for continued, larger growth through the 21st century. Rapid, substantial population growth as envisioned by these projections will impede movement toward an urban-industrial economy, with a burgeoning labor force exceeding the absorptive capacity of the modern sector. Job seekers will pile up in agriculture and the informal sector. Demands upon the government to deliver education and health services will also be extraordinarily high. High-tech niches will, however, continue expanding in India and Pakistan with overall negative social effects. Their low demand for labor will exacerbate income disparities, fuel interpersonal, interclass, and interregional tensions, and only contribute to eventual ethnic, communal, and political conflict. Immediate, coordinated policy is urged to achieve balanced low mortality and low fertility over the next few decades.
Bangkok, Thailand, Economic and Social Commission for Asia and the Pacific, Population Division, 1988. 1 p.This sheet gives the 1987 demographic estimates for Asian and Pacific countries and areas. Countries and areas are grouped under ESCAP, East Asia, South-East Asia, South Asia and the Pacific. Estimates are offered for mid-1987 population, average annual growth rate, crude birth rate, crude death rate, total fertility rate, male and female life expectancy at birth, infant mortality rate, % aged 0-14, % aged 65+, density, and population projected to 2010. Also included are 2 charts depicting the estimated and projected population of the ESCAP region by broad age group for 1960, 1985, and 2010, and the estimated and projected total fertility rate of ESCAP subregions, 1960 to 2010. Some estimates for the ESCAP region include a mid-1987 population of 2,805,056,000; a 1.82% average annual growth rate; a 27.5 crude birth rate; a 9.3 crude death rate; a fertility rate of 3.3; male and female life expectancies of 61.8 and 64.1, respectively; an infant mortality rate of 72; 89 persons/square kilometer; 33.5% of the population aged 0-14, 4.8% of the population aged 65+; and a population projected to reach 3,866,375,000 by 2010.
PEOPLE. 1987; 14(2):25.At some time during 1987 the 5 billionth person will be born according to the UN Population Division. If the UN media variant projections are accurate, the world will pass the 5 billion mark between April and July 1987. The world's population is expected to total 6 billion in 1999, 7 billion in 2010, and 8 billion in 2022. At the time the population reaches 5 billion, the annual global rate of population growth is estimated to be 1.63%. According to the medium-variant projections, the growth rate will drop to about 1.4% by 2000 and to less than 1% by 2025. Despite the relatively recent decline in the growth rate of the world, the annual increment to the total population continues to increase. Half of the world's 5 billion people in 1987 will be under age 24 and close to 1/3 will be children under age 15. 1 billion persons will be in the 15-24 age group; about 1 of 10 will be age 60 or older. 1 of 25 persons will be 70 years or older. By the middle of 1987, 42% of the world's population, or 2.1 billion people, will reside in urban areas, and it is anticipated that more than half of the world's 7 million people will live in towns and cities by 2010.
New York, New York, United Nations, 1987. ix, 385 p. (ST/ESA/SER.R/70.)The report presents the estimated and projected sex and age distributions according to the medium, high, and low variants for population growth for 1950-2025 for countries and areas generally with a population of 300,000 and over in 1980. The data for smaller countries or areas are included in the regional population totals and are not given separately. This report supplements the report on the WORLD POPULATION PROSPECTS: ESTIMATES AND PROJECTIONS AS ASSESSED IN 1984, which presents methods, data, assumptions, and a summary of major findings of the estimates and projections, as well as selected demographic indicators for every country or area of the world. The sex and age distributions of population in this report are based on the 10th round of the global demographic assessments undertaken by the UN Secretariat. They are derived from data that were available to the UN generally by the beginning of 1985; therefore, the figures presented supercede those that were previously published by the UN.
POPULATION BULLETIN OF THE UNITED NATIONS. 1987; (19-20):70-81.This is a survey of the U.N. Population Division's contributions to the study of urbanization and internal migration, related research, and publications. In order to review these contributions, the relevant U.N. publications are classified under five broad topics: "estimates and projections of urban, rural and city populations, including problems of data comparability and methods to measure internal migration; monitoring of trends in urbanization; estimates and analyses of migration as a component of urban and metropolitan growth; studies of demographic and socio-economic aspects of urbanization, and studies of demographic and socio-economic aspects of internal migration." (EXCERPT)
Population Today. 1986 Feb; 14(2):3, 8.The UN recently released its lastest population projection for 1985-2025. Although demographers remain uncertain about the future shape and rate of population growth, the UN figures are generally regarded as representing the state of the art in projection making. The UN makes medium, high, and low variant projections. According to the medium variant, the world population, in millions, will be 4,837 in 1985, 6,122 in 2000, 7,414 in 2015, and 8,206 in 2025. High and low variant projections, in millions, for 2025 are 9,088 and 7,358. The medium variant projection indicates that between 1985-2025 the population, in millions, will increase from 3,663-6,809 in the developing countries but only from 1,1754-1,396 in the developed countries. In other words, the proportion of the world's population residing in the developed countries will decrease from 24%-17% between 1985-2025. The world's growth rate will continue to decline as it has since it peaked at 2.1% in 1965-70. According to the medium variant, the projected growth rate for the world will be 1.63% between 1985-90, 1.58% between 1990-95, 1.38% between 2000-05, 1.18% between 2010-15, and 0.96 between 2020-25. The growth rate will decrease from 1.94%-1.10% for the developing countries and from 0.60%-0.29% for the developed countries between 1985-2025. The medium variant projections assume that the total fertility rate will decrease from 3.3 in 1985-90 to 2.8 in 2000-05 and to 2.4 in 2020-25. Respective figures are 3.7, 3.0, and 2.4 for the developing countries only and 2.0, 2.0, and 2.1 for the developed countries only. By 2025 the age structure of the developing countries is expected to be similar to the current age structure of the developed countries. In 2025, the 10 countries with the largest populations and their expected populations, in millions, will be China (1,475), India (1,229), USSR (368), Nigeria (338), US (312), Indonesia (273), Brazil (246), Bangladesh (219), Pakistan (210), and Mexico (154). The populations of some countries which are relatively small at the present time will be quite large in 2025. For example, the population, in millions, will be 111 for Ethiopia and 105 for Vietnam. The projections are summarized in 4 tables.
In: Population prospects in developing countries: structure and dynamics, edited by Atsushi Otomo, Haruo Sagaza, and Yasuko Hayase. Tokyo, Japan, Institute of Developing Economies, 1985. 115-40, 329. (I.D.E. Statistical Data Series No. 46)This paper reviews the various methods of projecting future numbers of households, summarizes prospective major trends in the numbers of households and the average household size among the developing countries prepared by the UN Population Division in 1981, and analyzes the size structure of households among the developing countries in contrast to the developed nations. The purpose of this analysis is to prepare household projections by size (average number of persons in a household) for the developing countries. The headship rate method is now the most widely used procedure for projecting households. The headship rate denotes a ratio of the number of heads of households, classified by sex, age, and other demographic characteristics such as marital status, to the corresponding classes of population. When population projections have become available by sex, age, and other characteristics, the projected number of households is obtained by adding up over all classes the product of projected population and projected headship rate. In addition to the headship rate method, this paper also reviews other approaches, namely, simple household-to-population ratio method; life-table method, namely the Brown-Glass-Davidson models; vital statistics method by Illing; and projections by simulation. Experience indicates that the effect of changes in population by sex and age is usually the most important determinant of the change in the number of households and it would be wasteful if the household projections failed to employ readily population projections. Future changes in the number of households among the developing countries are very significant. According to the 1981 UN projections, the future increase in the number of households both in the developed and developing countries will far exceed that in population. In 1975-80 the annual average growth rate of households was 2.89% for the developing countries as a whole while that for population was 2.08%. In 1980-85, the growth rate for households for the developing countries will be 2.99%, while that for population will be 2.04%. In 1995-2000 the figure for household growth will be 2.89%, whereas that for population will be 1.77%. The past trend of fertility is the most important factor for the reduction of household size and it would continuously be the central factor. The increasing headship rates will be observed among the sex-age groups, except the young female groups, as a result of increasing nuclearization in households.
In: Population prospects in developing countries: structure and dynamics, edited by Atsushi Otomo, Haruo Sagaza, and Yasuko Hayase. Tokyo, Japan, Institute of Developing Economies, 1985. 39-57, 326-7. (I.D.E. Statistical Data Series No. 46)A comparative study on mortality trends of developing countries was conducted by making use of UN projections of mortality measures. These mortality measures projected by the UN were used to observe future prospects of general mortality trends in selected countries. Under several research projects of the Institute of Developing Economies (IDE), some attempts were made to analyze recent trends of cause-specific mortality covering several selected countries. Estimates of future changes in cause-specific mortality may be considered useful to supply basic information needed for social and economic development planning of a country. Trends of mortality changes in the 1950s and 1960s were characterized in many countries by a rapid decline. Such a declining trend of mortality was brought about initially by a successful control of infectious and parasitic diseases accompanied by improvements in living conditions of the people in general. Thus the mortality of less developed countries that had been affected to a greater extent directly by infectious and parasitic diseases could be improved more drastically at such a stage. After the 1970s the pace of decline in mortality slowed down gradually to a considerable extent all over the world but was more prominent among more developed countries. In most countries mentioned in this discussion, regardless of whether they are more or less developed, the crude death rate is expected to reach the lowest level within a few decades. In many instances of developing countries, the crude death rate is assumed to reach such a minimum level in and around 2000. After reaching the lowest level, the crude death rate will turn to increase in varying degrees. Such a rise in crude death rate does not imply deterioration of mortality conditions. The crude death rate is often affected by the sex-age composition of the population. In contrast to the crude death rate, in most countries selected here, the expectation of life at birth is expected to expand steadily towards the future during the whole duration of this projection. An analytical observation was made on the cause-specific mortality for 10 selected countries covering the period from 1970 to the latest year for which basic data were available on the 8th (1965) revision of International Statistical Classification. Future prospects of cause structure of deaths will be very much influenced by proccesses effected by policy making and planning, and projections of cause-specific mortality should be made with an aim toward providing useful information for policy making and planning for national development.
In: Population prospects in developing countries: structure and dynamics, edited by Atsushi Otomo, Haruo Sagaza, and Yasuko Hayase. Tokyo, Japan, Institute of Developing Economies, 1985. 1-15, 325. (I.D.E. Statistical Data Series No. 46)This discussion covers the prospects of population growth in Asian countries, prospects of changes in sex-age structures in Asian countries, and the effect of urbanization on national population growth in developing countries. According to the UN estimates assessed in 1980, size of total population of Asian countries recorded 2580 million in 1980, which accounted for 58.2% of total population of the world. As it had shown 1390 million, accounting for 55.1% of the world population in 1950, it grew at a higher annual increase rate of 2.08% than that of 1.90% for the world average during the 30 years. On the basis of the UN population projections assessed in 1980 (medium variant), the world population attains 6121 million by 2000, and Asian population records 3555 million, which is 58.0% of the total population of the world and which is a slightly smaller share than in 1980. The population of East Asia shows 1475 million and that of South Asia 2077 million. During 20 years after 1980, the population growth becomes much faster in South Asia than in East Asia. After 1980 the population growth rate in Asia as well as on the world average shows a declining trend. In Asia it indicates 1.72% for 1980-90 and 1.50% for 1990-2000, whereas on the world average it shows 1.76% and 1.49%, respectively. The population density for Asia showing 94 persons per square kilometer, slightly lower than that of Europe (99 persons) as of 1980, records 129 persons per square kilometer and exceeds that of Europe (105 persons) in 2000. According to the UN estimates assessed in 1980, the sex ratio for the world average indicates 100.7 males/100 females as of 1980, and it shows 104.1 for Asia. This is higher than that for the average of developing countries (103.2). In the year 2000 it is observed generally in the UN projections that the countries with a sex ratio of 100 and over as of 1980 show a decrease but those with the ratio smaller than 100 record an increase. Almost all Asian countries are projected to indicate a decrease in the proportion of population aged 0-14 against the increases in that aged 15-64 and in that aged 65 and older between 1980-2000. In 1980 the proportion of population aged 0-14 showed more than 40.0% in most of the Asian countries. In the year 2000 almost all the countries in East Asia and Eastern South Asia indicate larger than 60.0% in the proportion of adult population. Urbanization brings about the effects of reducing the speed of increase in a national population and of causing significant changes in sex and age structures of the national population. Considering the future acceleration of urbanization in Asian countries, the prospects of growth and changes in sex and age structures of populations in Asian countries may need to be revised from the standpoint of subnational population changes.
In: State of the world 1985. A Worldwatch Institute report on progress toward a sustainable society [by] Lester R. Brown, Edward C. Wolf, Linda Starke, William U. Chandler, Christopher Flavin, Sandra Postel, Cynthia Pollack. New York, New York, W.W. Norton, 1985. 200-21.The demographic contrasts of the 1980s are placing considerable stress on the international economic system and on national political structures. Runaway population growth is indirectly fueling the debt crisis by increasing the need for imported food and other basic commodities. Low fertility countries are food aid donors, and the higher fertility countries are the recipients. In most countries with high fertility, food production per person is either stagnant or declining. Population policy is becoming a priority of national governments and international development agencies. This discussion reviews what has happened since the UN's first World Population Conference in 1974 in Bucharest, fertility trends and projections, social influences on fertility, advances in contraceptive technology, and 2 major family planning gaps -- the gap between the demand for family planning services and their availability and the gap between the societal need to slow population growth quickly and the private interests of couples in doing so. The official purpose of the 1984 UN International Conference on Population convened in Mexico City, in which 149 countries participated, was to review the world population plan of action adopted at Bucharest. In Bucharest there had been a wide political schism between the representatives of industrial countries, who pushed for an increase in 3rd world family planning efforts, and those from developing countries, whose leaders argued that social and economic progress was the key to slowing population growth. In Mexico City this division had virtually disappeared. Many things had happened since Bucharest to foster the attitude change. The costly consequences of continuing rapid population growth that had seemed so theoretical in the 1974 debate were becoming increasingly real for many. World population in 1984 totaled 4.76 billion, an increase of some 81 million in 1 year. The population projections for the industrial countries and East Asia seem reasonable enough in terms of what local resource and life support systems can sustain, but those for much of the rest of the world do not. Most demographers are still projecting that world population will continue growing until it reaches some 10 billion, but that most of the 5.3 billion additional people will be concentrated in a few regions, principally the Indian subcontinent, the Middle East, Africa, and Latin America. What demographers are projecting does not mesh with what ecologists or agronomists are reporting. In too many countries ecological deterioration is translating into economic decline which in turn leads to social disintegration. The social indicator that correlates most closely with declining fertility across the whole range of development is the education of women. Worldwide, sterilization protects more couples from unwanted pregnancy than any other practice. Oral contraceptives rank second. The rapid growth now confronting the world community argues for effective family planning programs.
Population and Development Review. 1984 Mar; 10(1):103-26.This paper presents some of the results of projections prepared by the World Bank in 1983 for all the world's countries. The projections (presented against a background of recent demographic trends as estimated by the United Nations) trace the approach of each individual country to a stationary state. Implications of the underlying fertility and mortality assumptions are shown mainly in terms of time trends of total population to the year 2100, annual rates of growth, and absolute annual increments. These indices are shown for the largest individual countries, for world regions, and for country groupings according to economic criteria. The detailed predictive performance of such projections is likely to be poor but the projections indicate orders of magnitude characterizing certain aggregate demographic phenomena whose occurrence is highly probable and set clearly interpretable reference points useful in discussing contemporary issues of policy. (author's)
In: United Nations. Department of International Economic and Social Affairs. Population projections: methodology of the United Nations. New York, N.Y., United Nations, 1984. 67-74. (Population Studies, No. 83; ST/ESA/SER.A/83)This paper draws attention to the large variation in national practices to determine localities and to classify urban populations which has serious implicatons for any projections of urban and city populations, no matter what specific methodology is being used. There are many criteria by whichlocalities can be defined as urban: population size, population density, % labor force in non-agriucltural activities, function of the city, some other unspecified "urban" characteristics or a combination of several of these criteria. Population size is deemed the preferable criterion for designating localities as urban. This criterion is consistent with one of the classic definitions of urbanization: "Urbanization is a process of population concenttration. It proceeds in 2 ways: the multiplication of points of concentration and the increase in size of individual concentration." Population size is also the most widely available criteria for localities. Procedures used by the UN to estimate and project urban and city population are given. The UN utilizes a measure of urbanization called the urban-rural ratio (URR), which is defined as the ratio of the urban to the rural population for a country at a given point in time. While attempts are being made to provide as complete a coverage of cities as possible, no standard guidelines have so far been used to systematically include all cities that will reach 100,000 population during the projection period. It is hoped that detailed discussion of the data and the conceptual and procedural problems will lead users of the estimates and projections to carefully consult the respective sources and definitions when they use these results for comparative purposes.
In: United Nations. Department of International Economic and Social Affairs. Population projections: methodology of the United Nations. Papers of the United Nations Ad Hoc Expert Group on Demographic Projections, United Nations Headquarters, 16-19 November 1981. New York, United Nations, 1984. 15-6. (Population Studies No. 83; ST/ESA/SER.A/83)As the UN demographic estimates and projections cover all the developed and developing countries, special problems are encountered in data collection and evaluations. The responsibility for the UN projections rests primarily with the Population Division, but the results are the product of collaboration by all responsible offices within the UN system. This is 1 of the strengths of the UN population projections, yet there are numerous problems concerning those projections. Aside from the perpetual difficulties with collection and estimation of basic demographic indicators from incomplete data, all of which must be continuously undertaken, there are 8 major problems which have become more important in recent years and concern the current UN demographic projections. The 1st problem is the question of meeting the needs of the users who are the researchers, the planners, and the policymakers. The 2nd problem is that significant improvement can be made in the methodologies with, on the 1 hand, the prodigious advances in calculation devices and research techniques and on the other, a better knowledge of the economic and social context of demographic variables. The 3rd major problem in the component method of projections of fertility, which continues to be the most influential component to the future population of most nations. Another component of projection, mortality, has become a pressing issue in the field of projection as well. Knowledge of mortality in the third world is highly fragmentary. The 5th problematic issue is urbanization and city growth. There are severe problems with data comparability and projection methods. Sixth, for several developing and developed countries international migration plays a significant role in their population growth. More problematic than estimating the current net numbers of migrants is formulating assumptions about future patterns of international migration. Seventh, thus far demographic projections have largely been based on the demographic theory of transition, which appears to continue to be useful for developing countries. Yet, the demographic transition models are affected by a wider variety of trajectories than anticipated. Finally, no one has been able to explain clearly the major simultaneous movements of fertility of the developed countries. The question of obvious policy significance is what will happen in the future.
New York, N.Y., United Nations, 1984. 85 p. (Population Studies, No. 83; ST/ESA/SER.A/83)Upon a recommendation of the Population Commission, at its 20th session in January 1979, the Secretary General of the United Nations convened an Ad Hoc Group of Experts on Demographic Projections from 16 to 19 November 1981 at the UN Headquarters to discuss the methodology used for demographic projections and to consider the relationship of demographic projections to development change and population policies. The expert Group was also requested to provide guidelines and make recommendations to the Secretary-General on how to incorporate demographic changes into the methodology to be used for the next round of world population projections to be prepared by the UN Population Division in collaboration with the regional commissions. The papers prepared by members of the Expert Group as well as those prepared by the Population Division are reproduced in this publication. The recommendations of the Expert Group and a summary of the papers and discussion are also included. The topics addressed in this publication are: 1) problems in making population projections; 2) integration of socioeconomic factors in population projections; 3) population projections as an aid to the formulation and implementation of population policies; 4) current projection assumptions for the United Nations demographic projections; 5) expectations and progressive analysis in fertility prediction; 6) use of the intermediate factors in fertility projections; 7) family planning and population projections; 8) progress of work on a fertility simulation model for population projections at the UN Secretariat; 9) mortality trends and prospects in developing countries: some "best data" indications; 10) the urban and city population projections of the UN: data, definitions and methods; 11) a critical assessment of urban-rural projections with special reference to UN methods; and 12) projections in Europe: some problems.
In: United Nations. Department of International Economic and Social Affairs. Population projections: methodology of the United Nations. New York, N.Y., United Nations, 1984. 25-32. (Population Studies, No. 83; ST/ESA/SER.A/83)The United Nations population projection assumptions are statements of expected trends in fertility, mortality and migration in the world. In every assessment, each of the 3 demographic components is unambiguously specified at the national level for each of the 5-year periods during the population interval (1950-2025). The approach used by the UN in preparing its projections is briefly summarized. At the general level, the analyst relies on available information of past events and current demographic levels and differentials, the demographic trends and experiences of similar countries in the region and his or her informed interpretations of what is likely to occur in the future. One common feature of the UN population projections that guides the analyst in preparing the assumptions is the general conceptual scheme of the demographic transition, or the socio-economic threshold hypothesis of fertility decline. As can be observed from the projected demographic trends reported in this paper, population stabilization at low levels of fertility, mortality and migration is the expected future for each country, with the only important differences being the timing of the stabilization. Irrespective of whether the country is developed, with very low fertility (for example, the Federal Republic of Germany or Japan), or developing with high fertility (such as, Bangladesh or the Syrian Arab Republic), it is assumed that fertility will arrive at replacement levels in the not too distant future. Serious alternative theories or hypotheses of population change, such as declining population size, are not only very few in number, but they tend to be somewhat more unacceptable and inconvenient to the demographic analyst as well as being considerably less palatable to goverments.
Population Bulletin of the United Nations Economic Commission For Western Asia. 1980 Jun; 18:65-80.The United Nations Population Division has been preparing world population estimates and projections by region since 1951, by country since 1958, and by sex and age for each country since 1968. The latest revision of the projections was prepared in 1978. The 2 basic methods of preparing population projections are mathematical and component, and the component methods are most widely used at present, by both national governments and the United Nations. Before projections are prepared, the base data must be evaluated and adjusted. In the UN projections, the assumptions imply that orderly progress will be made and that there will be no catastrophes such as famines and epidemics during the projection period. The projectins are prepared in 4 variants--"medium", "high," "low," and "constant." A major source of uncertainty in populations arises from the problem of estimating future fertility. Changes in fertility affect the age distribution and the total population size more than changes in mortality. At the UN, mortality assumptions are initially made in terms of life expectancy at birth and then in terms of age-sex patterns of probabilities of survival corresponding to different life expectancy levels at birth. Some of the results of the 1978 revision of the medium variant of the estimates and projections are shown in table form. The world total population of 4,033,000,000 in 1975 is projected to reach 6,199,000,000 by the year 2000. Among the major areas and regions of the world, the most rapid population growth for the future is projected for the Arab countries, Africa and Latin America. Of the 2 Arab regions, North Africa and Southwest Asia, Southwest Asia is expected to have the higher rate of growth because of assumed continued immigration. Within the Arab regions, there has been an increasing diversity in the rate of population growth. This divergence is expected to narrow with assumed decreased migration rates during the 1980s.
San Francisco, California, Sierra Club, 1982 Jan. 153 p.Designed for environmental and community activists who want to understand population projections, this handbook provides information on the following: ways of talking about population, i.e., censuses, estimates, forecasts, projections, and predictions; evaluating projections; policy debates; projections and wastewater--a case study of federal projections policy, types of population projections (projection methodologies, i.e., extrapolation, land use models, demographic models, econometric models, and ratio methods; geographic scope of projections; subject of projections; short-term and long-term projections; dissaggregating projections; and special information and ad hoc adjustments); how projections are developed (fertility, mortality, migration to the US and within the country, projections and policy, and zero population growth and determining if it has been reached); common errors; and the cast of characters (government agencies that prepare national or subnational projections, private groups that prepare projections, other groups active in the politics of projections, and regular publications and newsletters). Recently, the "politics of population projections" has intensified considerably, with more local governments and interest groups recognizing the power of projections. It is this handbook's goal to facilitate an individual's participation in these local and state debates. The basic idea of a projection done by extrapolation is the assumtpion that a trend in the past will continue into the future. 2 common types of extrapolations are the linear and the exponential. When examining a region for which data on land parcels is available, zoning and the current rate and types of housing construction can be used to projct the number of households. The demographic model breaks population growth into components of fertility, mortality, and migration, and further breaks down fertility and mortality by age, and migration into immigration and emigration. Econometric models of population change are predicated upon a presumed relationship between job availability and migration to or from an area. Ratio methods are frequently used to project population for areas lacking adequate data for using other methods. Projections for the world and for individual countries are prepared by the UN, by academic demographers, and by individual governments. In the US, projections for the world, for countries (including the US, and for individual states) are prepared by subunits of the Bureau of the Census.