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st: Update to -oaxaca- available from SSC

From   "Ben Jann" <>
To   statalist <>
Subject   st: Update to -oaxaca- available from SSC
Date   Wed, 14 May 2008 22:35:44 +0200

Thanks to Kit Baum, an update to the -oaxaca- package is available
from the SSC Archive. -oaxaca- is used to compute the Blinder-Oaxaca
decomposition of outcome differentials (i.e. wage gaps by race).

To install the update, type

 . ssc install oaxaca, replace

or use the -adoupdate- command.

-oaxaca- was slow if many covariate were specified because -nlcom- was
used to compute the variance-covariance matrix of the decomposition
results. -oaxaca- now has its own implementation of the delta method
based on analytic derivatives and is therefore much faster.

Furthermore, -oaxaca- returned error if subop() was used in the svy()
option. This is fixed.

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