Journal Article An Econometric Model of the Medicare System: Reply Get access Martin S. Feldstein Martin S. Feldstein Harvard University Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Economics, Volume 87, Issue 3, August 1973, Pages 490–494, https://doi.org/10.2307/1882018 Published: 01 August 1973

[The problem of collinearity suggests the search for an alternative to ordinary least squares which, although biased, might reduce the mean square error of the coefficient of interest. Two types of estimators are examined, and the corresponding mean square error loss functions are calculated.]

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