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Population Heterogeneity and Inference from Panel Data on the Effects of Vocational Education

Nicholas M. Kiefer
Journal of Political Economy
Vol. 87, No. 5, Part 2: Education and Income Distribution (Oct., 1979), pp. S213-S226
Stable URL: http://www.jstor.org/stable/1829915
Page Count: 14
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Population Heterogeneity and Inference from Panel Data on the Effects of Vocational Education
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Abstract

This paper considers a model of earnings over time which incorporates individual effects and time effects without assuming that these effects are orthogonal to the variable of primary interest. The central coefficient is the effect of participation in a Manpower Development and Training Act training program on the earnings of trainees. Since the training status of (some) individuals in the sample changes during the period of the sample, both pre- and posttraining contrasts and trainee-nontrainee contrasts in earnings can be made. An estimate of the cross-section bias in a training coefficient can be made directly. The extent of the analogous bias in the education coefficient in regression studies is a point of current debate. The cross-section bias in the sample analyzed is large, and the estimated effect of training is small and positive.

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