Although the forward method implies that no persons who died during period t have migrated, the reverse method implies that all those in the estimated migrating cohort who died during period t are migrants. To avoid either of these extreme errors, an "average" techniques, as portrayed to measure migration differentials, are concerned only with net movements and provide no insight into the spatial characteristics of migration.The residence and nativity methods of estimating migration from population census data, as previously described, may be readily utilized to measure migration differentials, provided it is possible to disaggreate the necessary data into the paticular population component categories desired.Once again, since the information contained in continuous population registers is likely to be relatively complete, these registers are by far the most satisfactory source of data from which measures of differentials in migration may be made.
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