This book chapter starts by discussing the major producers of international, national, and subnational projections. Next, it provide a description of the methods and materials used in preparing three basic types of population projections: (1) trend extrapolation; (2) the cohort-component method; and (3) structural modeling. The authors briefly discuss methods for preparing related projections on such topics as school enrollment, employment, and households. They follow this with a review of issues that we believe should be considered when preparing or evaluating population projections, including a discussion of forecast accuracy. The authors close with several conclusions regarding the nature and utility of population projections.
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