NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Accounting for Dropouts in Evaluations of Social Experiments

James Heckman, Jeffrey Smith, Christopher Taber

NBER Technical Working Paper No. 166
Issued in September 1994
NBER Program(s):   LS

This paper considers the statistical and economic justification for one widely-used method of adjusting data from social experiments to account for dropping-out behavior due to Bloom (1984). We generalize the method to apply to distributions not just means, and present tests of the key identifying assumption in this context. A reanalysis of the National JTPA experiment base vindicates application of Bloom's method in this context.

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Document Object Identifier (DOI): 10.3386/t0166

Published: Review of Economics and Statistics, Vol. 80, no. 1 (1998): 1-14.

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