An Intervening Opportunities Model of U.S. Interstate Migration Flows
AbstractUnlike other constrained, spatial interaction models the intervening opportunities (IO) model is not often employed for migration analysis. In this paper, an attempt is made to perform an empirical examination of the 10 model, using migration data for the 48 conterminous states of the U.S. including the District of Columbia for the period 1975-1980. Ruiter's (1967) numerical method for estimating the basic parameter of the model, the L value, is employed and a program is developed to effect the iterative calibration procedure. Empirical results demonstrate that the model provides a reasonable distribution of observed U.S. migrations and compares favorably with the production constrained gravity model. Further applications of the model and some areas of research are suggested
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