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| Net Migration Rate× | Demographic Balancing Equation× | |
|---|---|---|
| Fachgebiet | Demographie | Demographie |
| Familie | Process / pipeline | Process / pipeline |
| Entstehungsjahr | 1976 | 1976 |
| Urheber≠ | Classical vital-statistics measure (formalized by Shryock & Siegel) | Classical demographic accounting identity |
| Typ≠ | Rate of net population change due to migration per unit population | Population accounting identity for change over a period |
| Wegweisende Quelle | 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 |
| Aliasnamen | Net Migration Ratio, Crude Net Migration Rate, Net Migration per 1000 | Balancing Equation of Population Change, Population Accounting Equation, Components of Population Change Identity |
| Verwandt | 4 | 4 |
| Zusammenfassung≠ | The net migration rate expresses the net effect of migration on a population's size as a rate: net migration — in-migrants minus out-migrants over a period — divided by the population at risk, conventionally stated per 1000 people. It is the migration counterpart to the rate of natural increase and a standard component of population accounting. Because directional migration flows are often poorly recorded, net migration is frequently not counted directly but estimated as a residual from the demographic balancing equation or by comparing surviving cohorts across two censuses. | 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. |
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