Abstract

ABSTRACT Migration data collected for periods of differing lengths will yield inconsistent population forecasts, inconsistent multiregional life tables, and alternative interpretations of mobility levels and migration patterns. In this paper, examples arc first given to illustrate the effects of migration interval choice on demographic variables. The moverstayer model and its generalizations are discussed in their role as models useful in achieving consistency. It is argued that in addition to the level of mobility, the geographic pattern of migration flows is also affected by the choice of interval width.

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