Wage decompositions with selectivity-corrected wage equations

A methodological note

Shoshana Neuman, Ronald L Oaxaca

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

This paper examines the implications of the standard Heckman (Heckit) correction for selectivity bias in wage and earnings functions that are subsequently used in wage decompositions. Even when justified, Heckit selectivity correction introduces some fundamental ambiguities in the context of wage decompositions. The ambiguities arise from group differences in the selection term which consists of a parameter multiplied by the Inverse Mills Ratio (IMR). The parameter is identified as the product of the standard deviation of the errors in the wage equation and the correlation between the wage equation error and the selection equation error. How should group differences in these parameters be interpreted in terms of structural differences and endowment effects? The same issue arises with respect to group differences in the IMR which reflect nonlinear group differences in the determinants of selection and in the probit coefficients.

Original languageEnglish (US)
Pages (from-to)3-10
Number of pages8
JournalJournal of Economic Inequality
Volume2
Issue number1
DOIs
StatePublished - 2004

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wage
Group
Wage decomposition
Wage equation
Selectivity
determinants
trend
Selectivity bias
Endowment effect
Coefficients
Heckman
Standard deviation
Earnings function
Probit
Wages

Keywords

  • Identification
  • Selectivity bias
  • Wage decompositions

ASJC Scopus subject areas

  • Organizational Behavior and Human Resource Management
  • Sociology and Political Science
  • Economics, Econometrics and Finance(all)

Cite this

Wage decompositions with selectivity-corrected wage equations : A methodological note. / Neuman, Shoshana; Oaxaca, Ronald L.

In: Journal of Economic Inequality, Vol. 2, No. 1, 2004, p. 3-10.

Research output: Contribution to journalArticle

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