st: oglm program now available at ssc

[Richard Williams <Richard.A.Williams.5@ND.edu>]

Thanks to Kit Baum, the -oglm- command is now available at SSC.

-oglm- is a Stata 9 user-written program that estimates Ordinal 
Generalized Linear Models. The actual values taken on by the 
dependent variable are irrelevant except that larger values are 
assumed to correspond to "higher" outcomes. Up to 20 outcomes are allowed.

By default, -oglm- uses the logit link and produces results identical 
to -ologit-. However, the logit link is not always the most 
appropriate for the data. Hence, the probit, complementary log-log, 
and log-log links can be specified with the link option, e.g. link(p) 
for probit, link(c) for complementary log- log, and link(ll) for log-log.

-oglm-'s greatest appeal may be to those who want something like the 
ocloglog and ologlog programs that official Stata lacks.  In 
addition, -oglm-'s support for linear constraints (e.g. constraining 
the effects of x1 and x2 to be equal) may sometimes make it an 
attractive alternative to -ologit-, -logit-, -oprobit- and -probit-.

-oglm- was written for Stata 9.1 and supports several prefix 
commands, including by, nestreg, xi, svy and sw.  Its predict command 
includes the ability to compute estimated probabilities.

-oglm- was inspired by SPSS's PLUM command and its results have been 
verified by checking it against PLUM.  However, users familiar with 
both programs should realize that SPSS and Stata use different names 
for the cloglog and loglog links.  -oglm- follows Stata's naming conventions.


-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
FAX:    (574)288-4373
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
WWW (personal):    http://www.nd.edu/~rwilliam
WWW (department):    http://www.nd.edu/~soc 
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