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D T Heinsman

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NIDA Research Monograph|January 1, 1997

Experiments versus quasi-experiments: do they yield the same answer?W R Shadish, D T Heinsman

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Search research articles

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NIDA Research Monograph|January 1, 1997

Experiments versus quasi-experiments: do they yield the same answer?W R Shadish, D T Heinsman

Pageof 1