The Journal of Human Resources · 1991 · 33 citations · 7 references
MedicineRehabilitation MedicineVocational EducationCausal InferenceImpact MeasurementVocational RehabilitationEconomic Impact AssessmentEmployee BenefitsRehabilitation BenefitsTreatment EffectsVocational EvaluationEarnings DeclineEconomic Evaluation Of RehabilitationFixed Effects RegressionImputation Of EarningsIncome Maintenance During RehabilitationVocational Rehabilitation FundingVocational Rehabilitation Policy
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Sample Selection Bias as a Specification Error
James J. Heckman · Econometrica · 1979 · 28.9K citations