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st: Heckman and Oaxaca


From   "Natalia N. F. Batista" <nbatista@usp.br>
To   statalist@hsphsun2.harvard.edu
Subject   st: Heckman and Oaxaca
Date   Mon, 25 Oct 2004 23:36:50 -0300

Hi everybody

    I´m estimating a Heckman wage equation to migrants and not migrants, and
after all I want to compare them by a Oaxaca decomposition, but I have a
question: there is any problem if my Heckman equation have some dummies? How
"decomp" command deal with the dummies variables? Does it take means of zeros
and ones? The results of my "decomp" give me discrimation % of -301.0 (D/R).
The % should not be between 0-100? The results are below:


Summary of decomposition results (as %)
-------------------------------------------
Amount attributable:             |    -10.3
- due to endowments (E):         |      5.2
- due to coefficients (C):       |    -15.5
Shift coefficient (U):           |     11.6
Raw differential (R) {E+C+U}:    |      1.3
Adjusted differential (D) {C+U}: |     -3.9
---------------------------------+---------
Endowments as % total (E/R):     |    401.0
Discrimination as % total (D/R): |   -301.0
-------------------------------------------

Thanks for the help, Natalia B.
________________________________
Pós Graduação IPE/USP





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