While sample weights are required for obtaining unbiased estimators of means and other indicators for descriptive statistics purposes, we follow the argumentation in Wooldridge (2002) and O’Donnell et al. ( This is the case provided that the source of the differences between the sample and the population proportions is not driven by the variable of interest, in this case infant mortality. Assuming that infant mortality does not strongly influence the choice of geographic residence, we therefore prefer the use of unweighted estimators.