Growth of U.S. population, 1940–1971, in the light of an interactive two-sex model |
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Authors: | Prithwis Das Gupta |
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Institution: | 1. Department of Sociology, University of Alabama, P. O. Box 6109, 35486, University, Alabama
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Abstract: | Since it is logically impossible to hold constant both male and female age-specific fertility rates, the intrinsic growth rates or the net reproduction rates for males and females, based on that assumption, are internally inconsistent. The interactive two-sex model presented in this paper holds constant a set of bivariate age-specific fertility rates by age of men and women and allows the male and female age-specific fertility rates to adjust themselves to achieve stability. The model gives the same intrinsic growth rate for both sexes and generates intrinsic age-specific fertility rates and intrinsic net reproduction rates for males and females which are consistent and can operate simultaneously on a population. The model is applied to the U.S. data for 1940–1971, and the results are compared with those obtained from the one-sex models. |
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