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Abstract Monte Carlo methods are used to study the efficacy of multivariate matched sampling and regression adjustment for controlling bias due to specific matching variables X when dependent variables are moderately nonlinear in X. The general conclusion is that nearest available Mahalanobis metric matching in combination with regression adjustment on matched pair differences is a highly effective plan for controlling bias due to X. Key Words: Covariance adjustmentNonrandomized studiesQuasi-experiments
Donald B. Rubin (Fri,) studied this question.
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