Examination of Two Sources of Error in the Estimation of Net Internal Migration*
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Two sources of errors in the estimation of net internal migration are examined. First, errors arising from the use of a single set of survival rates in all 48 states are examined by estimating net migration in ten states using both a national life table and state life tables. It is estimated that the median error arising from this source is about 14 per cent of the estimate of net migration. The second source of error examined is underenumeration of the population. The “built in” correction factor of Census survival rates is demonstrated algebraically, and one approach is made to estimating the magnitude of errors from this source when the assumptions are not justified. It is estimated that about one-third of the estimates of net migration are in error by 25 per cent or more due to the effects of underenumeration. These two estimates of error are quite rough and the main conclusion to be derived is that small relative differences in estimates of net migration should be interpreted with extreme caution.