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This chapter begins by discussing the conceptual difference between demographic estimates, forecasts and projections. In addition, the chapter reviews different projection methods and their use depending on the availability of relevant data and purpose for which the projections are being made. The chapter demonstrates the use of Gompertz and Logistic models in the projection of whole populations. A section of the chapter shows how the cohort-component method is used to obtain population projections by age and sex. It examines data requirements and variations on the assumptions about future trends and patterns in fertility, mortality and migration. Other methods of projection such as those involving the cohort change ratios are also discussed. In addition, methods for the projection of populations with given socio-economic characteristics is provided. Examples of the computational steps of various projection methods are also given.
KeywordsMigration Rate Total Fertility Rate Population Projection Survival Ratio Labour Force Participation Rate
- Australia. (2008). Australian historical population statistics 2008. Catalogue No. 3105.0.85.001. Canberra: Australian Bureau of Statistics. http://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/3105.0.65.0012008?. OpenDocument Accessed Feb 2013.
- Croxton, F. E., Cowden, D. J., & Klein, S. (1968). Applied general statistics. Chapter 13. London: Sir Isaac Pitman and Sons Ltd.Google Scholar
- George, M. V., Smith, D. A., Swanson, D. A., & Tayman, J. (2004). Population projections. In J. Siegel & D. A. Swanson (Eds.), The methods and materials of demography (2nd ed., pp. 561–601). San Diego: Elsevier/Academic.Google Scholar
- Gompertz, B. (1825). On the nature of the function expressive of the law of human mortality; and on a new mode of determining the value of life contingencies. Philosophical Transactions of the Royal Society, 115(27), 513–585.Google Scholar
- Smith, S., Tayman, J., & Swanson, D. A. (2001). State and local population projections: Methodology and analysis. New York: Kluwer Academic Press.Google Scholar
- Swanson, D. A., & Tedrow, L. (2012). Using cohort change ratios to estimate life expectancy in populations with negligible migration: A new approach. Canadian Studies in Population, 39, 83–90.Google Scholar
- United Nations. (2012a). World population prospects 2010 revision. New York: Department of Economic and Social Affairs.http://esa.un.org/unpd/wpp/index.htm. Accessed Feb 2013.
- United Nations. (2012b). Probabilistic population projections based on the 2010 revision of the World population prospects. New York: Department of Economic and Social Affairs. http://esa.un.org/unpd/ppp/index.htm. Accessed Feb 2013.
- Verhulst, P. F. (1845). Recherches mathématiques sur la loi d’accroissement de la population. Nouv. mém. de l’Academie Royale des Sci. et Belles-Lettres de Bruxelles, 18, 1–41.Google Scholar
- Verhulst, P. F. (1847). Deuxième mémoire sur la loi d’accroissement de la population. Mém. de l’Academie Royale des Sci., des Lettres et des Beaux-Arts de Belgique, 20, 1–32.Google Scholar