SSRN Electronic Journal · 2001 · 478 citations · 45 references
Public HealthBiostatisticsEconomicsCausal InferenceEconometricsExperimental DesignInferential StatisticsMatched-pair DesignsMatching MethodsMatching TheorySelection BiasStatistical InferenceMatchingMatching EstimatorsMatching Without Replacement
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Sample Selection Bias as a Specification Error
James J. Heckman · Econometrica · 1979 · 28.9K citations