estparm is an inverse of parmest. It inputs 2 or 3 variables in the varlist, containing parameter estimates, standard errors, and (optionally) degrees of freedom. It saves a set of estimation results for the parameters, assuming that the parameter estimates are statistically independent. estparmtest is an extended version of estparm, which also performs a chi-squared or F test of the hypothesis that all these parameters are equal. estparmtest can be used for performing interaction tests, using data from regression models for multiple subsets, stored in a parmest or parmby output dataset (or resultsset).