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| Demographic Balancing Equation× | Population Pyramid Analysis× | |
|---|---|---|
| Tieteenala | Väestötiede | Väestötiede |
| Menetelmäperhe | Process / pipeline | Process / pipeline |
| Syntyvuosi≠ | 1976 | 1874 |
| Kehittäjä≠ | Classical demographic accounting identity | Francis A. Walker (early age-sex diagrams); standard demographic practice |
| Tyyppi≠ | Population accounting identity for change over a period | Graphical and tabular analysis of population age-sex structure |
| Alkuperäislähde | Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512 | Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512 |
| Rinnakkaisnimet≠ | Balancing Equation of Population Change, Population Accounting Equation, Components of Population Change Identity | Age-sex pyramid, Population age structure diagram, Age structure analysis, Nüfus Piramidi Analizi |
| Liittyvät | 4 | 4 |
| Tiivistelmä≠ | The demographic balancing equation is the fundamental accounting identity of population change: a population at the end of a period equals its size at the start, plus births, minus deaths, plus in-migrants, minus out-migrants. It is the bookkeeping rule that ties together all the components of population dynamics and guarantees internal consistency in population estimates and projections. Because it is an exact identity, it also serves as a powerful estimation tool — any single unknown component, most often net migration, can be recovered as the residual once the others are known. | Population pyramid analysis is the description and interpretation of a population's age-sex structure through a back-to-back horizontal bar chart, with males on one side, females on the other, and age groups stacked from youngest at the bottom to oldest at the top. The shape of the pyramid encodes a population's fertility, mortality, and migration history and is the demographer's first diagnostic of whether a population is young and growing, ageing, or contracting. |
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