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DEVCON: Stata module to apply the deviation contrast transform to estimation results


  • Ben Jann

    () (University of Bern)


devcon transforms the coefficients of 0/1 dummy variables so that they reflect deviations from the "grand mean" rather than deviations from the reference category (the transformed coefficients are equivalent to those obtained by the so called "effects coding") and adds the coefficient for the reference category. The variance-covariance matrix of the estimates is transformed accordingly. The transformed estimated can be used with post estimation procedures. In particular, devcon can be used to solve the identification problem for dummy variable effects in the so-called Blinder-Oaxaca decomposition (see the oaxaca package).

Suggested Citation

  • Ben Jann, 2005. "DEVCON: Stata module to apply the deviation contrast transform to estimation results," Statistical Software Components S450603, Boston College Department of Economics, revised 31 Jul 2006.
  • Handle: RePEc:boc:bocode:s450603 Note: This module should be installed from within Stata by typing "ssc install devcon". Windows users should not attempt to download these files with a web browser.

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    dummy variables; grand mean; effects coding;


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