Propensity Score Matching - Statpower
Propensity Score Matching - Statpower
Propensity Score Matching - Statpower
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IntroductionModeling the CovariatesSubclassification<strong>Matching</strong>Balancing <strong>Score</strong>sThe <strong>Propensity</strong> <strong>Score</strong><strong>Matching</strong> MethodsUsing <strong>Propensity</strong> <strong>Score</strong>s – A General StrategyAn ExampleKey ImplicationsDefinition of a <strong>Propensity</strong> <strong>Score</strong>Key AssumptionMathematical PropertiesKey ImplicationsKey QuestionsIf strong ignorability holds, and treatment and control groupsare matched perfectly on their propensity scores, then thedifference in means between treatment and control groups is anunbiased estimate of treatment effects.Moreover, subclassification or covariance adjustment can alsoyield unbiased treatment effects.Multilevel<strong>Propensity</strong> <strong>Score</strong> <strong>Matching</strong>