IDONEPSU: Stata module for dealing with strata that have singleton PSUs

idonepsu identifies strata that have only one PSU and, optionally, merges them into the largest strata. This command should be used with caution as the appropriate merge of strata depends on the sample design. This utility is intended for persons doing large secondary data analysis where they are uncertain of the sampling strategy and are, therefore, unable to identify the appropriate strata in which to merge. The merge is done in accord with the method suggested by the Stata 7 manual.