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The differences in internal mobility between national populations are large and complex in origin. In studying them we must use comparable indicators. This paper discusses how meaures of migration intensity at the national level should be constructed, drawing on analyses of regional mobility in Australia and Britain. We argue for the tailoring of intensity measures to observation plan and to age-time plan, and for removing the effects of mortality and external migration on census-based measures. We propose simple estimation of infant migrants, a standard stopping-age in calulating gross measures of migration, and argue for the use of a common population for computing age-standardized measures of migration and a common mortality schedule for computing migration expectancies. We conclude with recommendations for developing cross-national measures of migration intensity.
Rees et al. (Sat,) studied this question.