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Marginal effects and extending the Blinder–Oaxaca decomposition for nonlinear models


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  • Tamás Bartus

    (Institute of Sociology and Social Policy, Corvinus University, Budapest)


Students of racial and gender inequalities are often interested in knowing to what extent an observed group difference can be attributed to differences in returns to productive abilities (discrimination effect) or to differences in the average of productive abilities (endowment effect). The standard Blinder–Oaxaca decomposition technique, which applies to continuous outcomes, measures the discrimination (endowment) effect in terms of differences in group-specific regression parameters (means), weighted by group-specific means (regression parameters). This article shows that the standard decomposition technique can be meaningfully extended to categorical outcomes if the regression coefficients are substituted with marginal effects. A user-written program, gdecomp (working title), is also presented, which basically processes marginal effects obtained from another user-written program, margeff. It is available from the SSC Archive.

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Paper provided by Stata Users Group in its series United Kingdom Stata Users' Group Meetings 2006 with number 05.

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Date of creation: 18 Sep 2006
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Handle: RePEc:boc:usug06:05

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  1. Alan S. Blinder, 1973. "Wage Discrimination: Reduced Form and Structural Estimates," Journal of Human Resources, University of Wisconsin Press, vol. 8(4), pages 436-455.
  2. Yun, Myeong-Su, 2004. "Decomposing differences in the first moment," Economics Letters, Elsevier, vol. 82(2), pages 275-280, February.
  3. Ronald L. Oaxaca & Michael R. Ransom, 1999. "Identification in Detailed Wage Decompositions," The Review of Economics and Statistics, MIT Press, vol. 81(1), pages 154-157, February.
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Cited by:
  1. Aguilar, Renato & Tansini, Ruben, 2010. "Pre-School Education and School Performance The Case of Public Schools in Montevideo," Working Papers in Economics 434, University of Gothenburg, Department of Economics.
  2. Renato Aguilar & Ruben Tansini, 2010. "Educación Preescolar y Rendimiento Escolar en las Escuelas Públicas de Montevideo," Documentos de Trabajo (working papers) 2010, Department of Economics - dECON.


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