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

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  • David Neumark

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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Bibliographic Info

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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Publication status: published as Neumark, David. "Biases In Twin Estimates Of The Return To Schooling," Education of Economics Review, 1999, v18(2,Apr), 143-148.
Handle: RePEc:nbr:nberte:0158

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  1. Ashenfelter, Orley & Krueger, Alan B, 1994. "Estimates of the Economic Returns to Schooling from a New Sample of Twins," American Economic Review, American Economic Association, vol. 84(5), pages 1157-73, December.
  2. 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.
  3. 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.
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Cited by:
  1. repec:fth:prinin:388 is not listed on IDEAS
  2. 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.
  3. Chiara Pronzato, 2009. "An Examination of Paternal and Maternal Intergenerational Transmission of Schooling," CHILD Working Papers wp20_09, CHILD - Centre for Household, Income, Labour and Demographic economics - ITALY.
  4. 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.

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