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Selection on Observed and Unobserved Variables: Assessing the Effectiveness of Catholic Schools

Joseph G. Altonji, Todd E. Elder and Christopher R. Taber
Journal of Political Economy
Vol. 113, No. 1 (February 2005), pp. 151-184
DOI: 10.1086/426036
Stable URL: http://www.jstor.org/stable/10.1086/426036
Page Count: 34
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Selection on Observed and Unobserved Variables: Assessing the Effectiveness of Catholic Schools
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Abstract

In this paper we measure the effect of Catholic high school attendance on educational attainment and test scores. Because we do not have a good instrumental variable for Catholic school attendance, we develop new estimation methods based on the idea that the amount of selection on the observed explanatory variables in a model provides a guide to the amount of selection on the unobservables. We also propose an informal way to assess selectivity bias based on measuring the ratio of selection on unobservables to selection on observables that would be required if one is to attribute the entire effect of Catholic school attendance to selection bias. We use our methods to estimate the effect of attending a Catholic high school on a variety of outcomes. Our main conclusion is that Catholic high schools substantially increase the probability of graduating from high school and, more tentatively, attending college. We find little evidence of an effect on test scores.

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