Journal
REVIEW OF ECONOMICS AND STATISTICS
Volume 86, Issue 1, Pages 108-132Publisher
M I T PRESS
DOI: 10.1162/003465304323023714
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Nonexperimental data are used to evaluate impacts of a Bolivian preschool program on cognitive, psychosocial, and anthropometric outcomes. Impacts are shown to be highly dependent on age and exposure duration. To minimize the effect of distributional assumptions, program impacts are estimated as nonparametric functions of age and duration. A generalized matching estimator is developed and used to control for nonrandom selectivity into the program and into exposure durations. Comparisons with three groups-children in the feeder area not in the program, children in the program for less than or equal to1 month, and children living in similar areas without the program-indicate that estimates are robust for significant positive effects of the program on cognitive and psychosocial outcomes with greater than or equal to7 months' exposure, although the age patterns of effects differ slightly by comparison group.
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