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st: Heckman and Oaxaca


From   "Natalia Ferreira" <nat6672@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Heckman and Oaxaca
Date   Thu, 28 Oct 2004 00:04:59 +0000

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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