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Smith, Ken R. | Biased estimation in policy research: an illustrative example of ridge regression in a health system model | The paper develops an argument for the necessity of examining individual coefficients in policy models. As a result of this need, it is posited that something other than OLS estimators should be used since they are inflated and have extremely large variances when multicollinearity is present. Furthe... | Policy models; Health systems; Ridge regression | 1980 |