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st: -oaxaca- decomposition


From   Ian Li <ian.li@uwa.edu.au>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: -oaxaca- decomposition
Date   Fri, 12 Aug 2011 09:09:39 +0800

Dear Statalisters

I am using Stata 11 on a windows computer.

I would like to ask for help with the -oaxaca- decomposition, details as follows:

SJ-8-4  st0151  . . .  The Blinder-Oaxaca decomposition for linear reg. models
        (help oaxaca if installed)  . . . . . . . . . . . . . . . . .  B. Jann
        Q4/08   SJ 8(4):453--479
        implements the Blinder-Oaxaca decomposition, which is often
        used to study mean outcome differences between groups

In particular, I am using the -oaxaca- function to decompose the wage differential between males and females, with the log of hourly wages as the dependent variable, and a number of explanatory variables on the right hand side. Let's call the explanatory variables X1, X2, X3, ..., X20. Variables X10 to X20 are a group of dummy variables, for example, the industry of employment.

I would like to report the estimated coefficients for X10 to X20 as one, so I would just sum up the estimated betas and report, for instance, that the industry of employment accounts for 5 percent of the endowment effects, of the raw wage gap. however, I would also like to report the robust standard error for this group as a whole. Is there a function in -oaxaca- that allows me to calculate the robust standard error for the group, or any other way to achieve this?

Regards
Ian
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