= Stata Weights = Stata supports multiple types of '''weights'''. <> ---- == Description == Frequency weights (i.e., `[fweight=wt]`) reflect duplication of rows. Inverse probability weights (i.e., `[pweight=wt]`) reflect the probabilities of sample selection across rows. These are appropriate for some types of survey analysis, but complex survey designs generally call for use of [[Stata/SvySet|svyset]]. Analytic weights (i.e., `[aweight=wt]`) reflect inverse contribution to [[Statistics/Variance|variance]]. 'Importance' weights (i.e., `[iweight=wt]`) reflect relative importance. This is a facility supported for commands to ''invent'' uses for, rather than a facility with general use. Any command using importance weights should explicitly define what they mean in that domain. ---- CategoryRicottone