Affinely Invariant Matching Methods with Ellipsoidal Distributions
Affinely Invariant Matching Methods with Ellipsoidal Distributions
Matched sampling is a common technique used for controlling bias in observational studies. We present a general theoretical framework for studying the performance of such matching methods. Specifically, results are obtained concerning the performance of affinely invariant matching methods with ellipsoidal distributions, which extend previous results on equal percent bias …