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st: -gologit2- update


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: -gologit2- update
Date   Thu, 19 Jan 2006 07:13:31 -0500

Thanks to Kit Baum, a new version of -gologit2- is available from SSC. The main changes are

* Although -gologit2- continues to work under Stata 8.2, if you are using Stata 9 it can now do survey data analysis with files that have been svyset in Stata 9.

* I fixed a bug that could sometimes keep -gologit2- from working correctly with -margeff- and possibly other post-estimation commands. If you want to use -gologit2- with -margeff-, give a command like

margeff, model(gologit)

* The ancillary file gologit2.pdf, which provides extensive documentation on the program, has been updated. (I don't think -adoupdate- catches changes in the ancillary files, by the way.) The same documentation (as well as a troubleshooting FAQ) can be found at

http://www.nd.edu/~rwilliam/gologit2/index.html

Here is a description of the program:

gologit2 estimates generalized ordered logit models for ordinal dependent variables. A major strength of gologit2 is that it can also estimate two special cases of the generalized model: the proportional odds model and the partial proportional odds model. Hence, gologit2 can estimate models that are less restrictive than the proportional odds/parallel lines models estimated by ologit (whose assumptions are often violated) but more parsimonious and interpretable than those estimated by a non-ordinal method, such as multinomial logistic regression (i.e. mlogit). Other key strengths of gologit2 include options for linear constraints, alternative model parameterizations, automated model fitting, survey data (svy) estimation, and the computation of estimated probabilities via the predict command. gologit2 is inspired by Vincent Fu's gologit program and is backward compatible with it but offers several additional powerful options.


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Richard Williams, Notre Dame Dept of Sociology
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