Assessing the Case for Social Experiments

Heckman, James J; Smith, Jeffrey A

doi:10.1257/jep.9.2.85

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Assessing the Case for Social Experiments

Author(s): James J Heckman , Jeffrey A Smith

Publication date Created: May 1995

Publication date (Print): May 1995

Journal: Journal of Economic Perspectives

Publisher: American Economic Association

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Choosing Among Alternative Nonexperimental Methods for Estimating the Impact of Social Programs: The Case of Manpower Training

V. Joseph Hotz, James J Heckman (1989)

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Scientific challenges in the application of randomized trials.

Joshua S. Shapiro, Jamie Kramer (1984)

In recent years, scientific challenges in the application of randomized trials have become more apparent, especially with the extension of such trials to the assessment of nondrug treatments, such as health education, psychotherapy, and health care provision. Six issues (individual v group randomization, blinding and unblinding, the effect of trial participation on outcome, selective subject participation, treatment compliance, and standardized v individualized treatment) are discussed in terms of their impact on internal validity, generalizability (external validity), and clinical relevance. Specific design strategies may be necessary to enhance these methodological and clinical desiderata. Attention to these challenges should lead to improvements in future randomized trials.