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st: oglm program now available at ssc
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
WWW (personal): http://www.nd.edu/~rwilliam
WWW (department): http://www.nd.edu/~soc
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