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ASIA-PACIFIC POPULATION JOURNAL. 1992 Dec; 7(4):61-80.The State Statistical Office with the support of UNDESD and UNFPA prepared 3 projections. A standard cohort component method was used to project populations by sex and 5-year age groups for each quinquennium between 1989 and 2019. 3 hypotheses were proposed. In Hypothesis 1, fertility was assumed to stabilize at a level of a TFR of 3.5 children per woman. In Hypothesis 3, fertility was assumed to decline up to the period 1990-2004 and up to the replacement level (2.23 children per woman during that period). Hypothesis 2 represents an intermediate situation between Hypothesis 1 and 3 which was considered as the most plausible future trend of fertility. According to Projection 2 the population of Mongolia will be almost 3.8 million in the year 2019. Projections 1 and 3 give total populations of 4.2 and 3.5 million, respectively. The difference between a TFR of 2.2 and 3.5 for the last quinquennium of the projection period resulted in a difference of around 700,000 people. The difference between Projections 1 and 2 is about 400,000 people. Considering the fertility assumptions adopted for these projections, it is not very likely that the size of the population at the turn of the century will be much smaller than 2.6 million or larger than 3 million. What is more uncertain is the scenario for the 2nd decade of next century. During the next 2 decades, the growth will become gradually more moderate. The main changes will be an increase in the proportion of the population between 15 and 64 years of age, a decline in the proportion of the young population of the young population resulting in a substantial decrease of the dependency ratio and an increase in the median age of the population. According to the 3 hypotheses, the young population will continue growing, albeit at a slower pace. There will be a decline in the proportion of young to old people and an increase in the proportion of the population in the working age groups. Yet, all age groups will continue to increase in absolute terms. International migration may produce some deviations in this expected profile.
New York, New York, United Nations, 1992. vii, 46 p. (ST/ESA/SER.A/127)Methods pertaining to the preparation of migration data for subnational population projections as of 1992 are explained. A brief review of sources of data for migration projections (censuses, surveys, and registration data) reveals that the requirements are base period estimates of the level or rate of migration between regions, estimates of the age and sex distribution of migrants, and any indicators that show likely future trends. In a discussion of the measurement of the volume of migration from census date, data on residence at a fixed prior time, estimates based on previous place of residence and duration of residence, and estimates of net migration of census survival/ratio methods are relevant. Estimates of the distribution of migrants by age and sex are explained based on different age and sex data: on place of residence at a fixed prior date, on place of previous residence and duration of residence, on age distributions from surveys, and from registers. Also explained is the use of model migration schedules when there is little or no information about age. Baseline migration projections for future estimates which are reasonable and account for variable rates of migration by region are discussed. The objectives desired are sometimes contradictory in that using a long time frame in order to average out random or abnormal fluctuations conflicts with continuing recent nonrandom or unusual changes so that emergent trends will be projected; objectives are also to use the most recent data available which account for shifts in migration patterns and to ensure convergence of migration rates toward equilibrium at some future point. Alternative strategies are provided as well as adjustments to provide consistent results. Adjustments involve the projection of numbers of migrants rather than rates, the use of out-migrant data on destination to adjust in-migration, and the scaling of in-migration to equal out-migration. Recommendations for data collection are presented. Internal migration data are best served by census data which asks the question about place of residence at a fixed prior time preceding the census and with a time interval designation that is of interest for projections. Single year of age and prior year questions and 5 years before are desired due to the need for short-range projections and planning. The 5-year prior place of residence question must be available by current region of residence and age and sex. Specific examples of multiregional projections are included.