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The schooling of Southern Blacks : the roles of legal activism and private philanthropy, 1910 - 1960
Donohue, John J.; Heckman, James J.; Todd, Petra - In: The quarterly journal of economics 117 (2002) 1, pp. 225-268
Persistent link: https://www.econbiz.de/10001643157
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Causal parameters and policy analysis in economics : a twentieth century retrospective
Heckman, James J. - In: The quarterly journal of economics 115 (2000) 1, pp. 45-97
Persistent link: https://www.econbiz.de/10001491398
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Substitution and dropout bias in social experiments : a study of an influential social experiment
Heckman, James J.; Hohmann, Neil; Smith, Jeffrey - In: The quarterly journal of economics 115 (2000) 2, pp. 651-694
Persistent link: https://www.econbiz.de/10001491750
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ARTICLES - Substitution and Dropout Bias in Social Experiments: A Study of an Influential Social Experiment
Heckman, James; Hohmann, Neil; Smith, Jeffrey; Khoo, Michael - In: The quarterly journal of economics 115 (2000) 2, pp. 651-694
Persistent link: https://www.econbiz.de/10007678914