7 Domain Estimation

If we are interested in a particular group of units in the population, we may consider estimation of subpopulation (domain) means. Domains are a concept at the estimation stage, which are often different from strata which are subpopulations defined at the survey design stage. For instance, we might be interested in people who have a university degree and those who do not have one. Treating the subset of the original survey dataset with units belonging to the domain of interest as if it is a stand-alone survey sample from the domain would yield incorrect standard errors. The following codes describe the correct way to perform domain analyses.