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Biases in Twin Estimates of the Return to Schooling: A Note on Recent Research

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David Neumark

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Abstract

Ashenfelter and Krueger's (1993) within-twin, measurement-error- corrected estimate of the return to schooling is about 13-16 percent. If their estimate is unbiased, then their results imply considerable downward measurement error bias in uncorrected within-twin estimates of the return to schooling, and considerable downward omitted ability bias in cross-section estimates. This note points out that if there are ability differences among twins, then AK's IV estimator exacerbates the omitted ability bias in the within-twin estimate. Thus, upward omitted ability bias in within-twin estimates may provide an alternative explanation of the surprisingly high estimates of the return to schooling that AK obtain, and permit their results to be reconciled with upward, rather than downward omitted ability bias in cross-section estimates.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Technical Working Papers with number 0158.

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Date of creation: Jun 1994
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Handle: RePEc:nbr:nberte:0158

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Find related papers by JEL classification:
C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data
J31 - Labor and Demographic Economics - - Wages, Compensation, and Labor Costs - - - Wage Level and Structure; Wage Differentials

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  1. Alan Krueger & Orley Ashenfelter, 1992. "Estimates of the Economic Return to Schooling from a New Sample of Twins," NBER Working Papers 4143, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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  2. Behrman, Jere R & Rosenzweig, Mark R & Taubman, Paul, 1994. "Endowments and the Allocation of Schooling in the Family and in the Marriage Market: The Twins Experiment," Journal of Political Economy, University of Chicago Press, vol. 102(6), pages 1131-74, December. [Downloadable!] (restricted)
  3. Griliches, Zvi, 1979. "Sibling Models and Data in Economics: Beginnings of a Survey," Journal of Political Economy, University of Chicago Press, vol. 87(5), pages S37-64, October. [Downloadable!] (restricted)
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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Chiara Pronzato, 2008. "Why Educated Mothers don’t make Educated Children? A Statistical Study in the Intergenerational Transmission of Schooling," Discussion Papers 563, Research Department of Statistics Norway. [Downloadable!]
    Other versions:
  2. Cecilia Rouse, 1997. "Further Estimates of the Economic Return to Schooling from a New Sample of Twins," Working Papers 767, Princeton University, Department of Economics, Industrial Relations Section.. [Downloadable!]
  3. William N. Evans & Edward Montgomery, 1994. "Education and Health: Where There's Smoke There's an Instrument," NBER Working Papers 4949, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  4. repec:fth:prinin:388 is not listed on IDEAS
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