st: New version of -groupcl- package on SSC

[Paulo Guimaraes <guimaraes@moore.sc.edu>]

Thanks to Kit Baum, a new version of the -groupcl- package is now 
available for download from SSC. The new version includes an option to
compute a pearson specification test for both the "multin" and "dirmul"
commands.
A description of the package follows:

Package Name: groupcl

Tittle: Module to estimate grouped conditional logit models

 Description: In many applications of conditional logit models the
 choice set and the characteristics of that set are identical for
 groups of decision makers. In that case it is possible to obtain a
 more computationally efficient estimation of the model by grouping
 the data and employing "multin". The command "multin" is designed
 for estimation of grouped conditional logit models. It produces the
 same output as "clogit" but requires a more compact data layout.
 This is particularly relevant when the model comprises many
 observations and/or choices. In this situation it is possible to
 obtain substantial reductions in the size of the data set and the
 time required for estimation. The command "groupdata" converts the
 data as required by "clogit" to the new format required by
 "multin". The command "dirmul" performs Dirichlet-Multinomial (DM)
 regression which is a parametric alternative to deal with
 overdispersion in the context of the grouped conditional logit
 model. The "dirmul" command can also be used to estimate Beta-
 Binomial regression models.

 KW: conditional logit
 KW: grouped data
 KW: dirichlet-multinomial
 KW: Beta-Binomial

 Requires: Stata version 9

 Author: Paulo Guimaraes
 Support: guimaraes@moore.sc.edu


Best wishes

Paulo Guimaraes
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