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Computes a GLS matrix weighted estimator for a panel data set. meangroup.src does a similar estimator, but uses simple weighted average rather than a matrix-weighted average. Swamy(1970), Efficient Inference in a Random Coefficient Regression Model, Econometrica, vol 38, 311-323. (This abstract was borrowed from another version of this item.)
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P. A. V. B. Swamy (Sun,) studied this question.
www.synapsesocial.com/papers/69d7eb27a2a48916bbbee4b4 — DOI: https://doi.org/10.2307/1913012
P. A. V. B. Swamy
Econometrica
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