Thanks to Kit Baum, an update to the -oaxaca- package is available
from SSC. -oaxaca- computes the so-called Blinder-Oaxaca-Decomposition
for linear regression models. To install the update, type
. ssc install oaxaca, replace
This update also supersedes the version of -oaxaca- available as
package -st0151- from the Stata Journal.
Changes:
o The variable sets specified in -categorical()- have to fulfill
certain requirements for the decomposition results to be meaningful.
-oaxaca-, however, did not confirm these properties. Since many users
seemed to have trouble with this option, I now implemented some checks
and error messages to safeguard against misuse of the option.
o The dummy indicator sets specified in -categorical()- are now
automatically added to the list of independent variables.
o The estimated models can now be saved (e.g. for later tabulation)
via a new -store()- suboption in -model1()-, -model2()-, -pooled()-,
and -omega()-. The -suest- results can also be stored.
o -oaxaca- now displays a warning message if the variances of some of
the coefficients in the models are zero since this usually indicates
that something went wrong (e.g. insufficient number of observations,
dropped coefficients due to collinearity, ...).
o The -categorical()- option did not work if -nose- was specified;
this is fixed.
ben
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