st: update oparallel available from SSC

[Maarten Buis <maartenlbuis@gmail.com>]

Thanks to Kit Baum a new update of the -oparallel- package is now
available from SSC.  The update fixes a error with the number of
degrees of freedom when factor variables were used in the -ologit-
model (thanks Richard Williams and Scott Long for pointing this out to
me) and a typo in the help file (thanks Ariel Linden for spotting it).
 To install it, type in Stata -ssc install oparallel, replace-.

-oparallel- is a post-estimation command testing the parallel
regression assumption in a ordered logit model.  By default it
performs five tests: a likelihood ratio test, a score test, a Wald
test, a Wolfe-Gould test, and a Brant test.  These tests compare a
ordered logit model with the fully generalized ordered logit model,
which relaxes the parallel regression assumption on all explanatory
variables.  Optionally, oparallel can use the bootstrap to compute the
p-values for these tests.

I hope some of you will find it useful,
Maarten

---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
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