Causal Inference and Nonrandom Samples
James Heckman
Journal of Educational and Behavioral Statistics, 1989, vol. 14, issue 2, 159-168
Date: 1989
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jedbes:v:14:y:1989:i:2:p:159-168
DOI: 10.3102/10769986014002159
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