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...onal weighting matrix? (This would be similar to the "matrix accum" commands in Stata if that gives any useful guidance regarding the desired product.) 4) Is there a straightforward way to implement the computation of the variance covariance matrix for two-step estimation per Murphy and Topel (1985)? That aim is the underlying reason for questions (1)-(3). Thank you very much for your consideration. Best, Michael -- Michael Ash, Associate Professor of Economics and Public Policy Department of Economics and CPPA University of Massachusetts Amherst, MA 01003 Tel +1-413-545-6329 Fa...