Throughout this book, it was shown that indirect sampling is a convenient way to obtain a sample to produce estimates for a target population U B , when the only frame available is one for a population U A related to U B . Once the sample is selected, the GWSM can prove to be a viable solution for producing estimation weights in the context of indirect sampling. These weights lead to unbiased estimates. They roughly correspond to an average of the sampling weights for the units of the population U A from which the sample is selected. Recall that the GWSM works even if the links between the two populations U A and U B are complex, that is, they are of the type “many-to-many.”
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