Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: Interpretation of the estimates obtained by the -xtprobit- command
From
[email protected] (Brendan Halpin)
To
[email protected]
Subject
Re: st: Interpretation of the estimates obtained by the -xtprobit- command
Date
Thu, 29 Mar 2012 14:31:03 +0100
On Thu, Mar 29 2012, Yuval Arbel wrote:
> 4. I also ran the command -xtlogit- with the -fe- option (attached
> below). The algorithm omitted many panels and I got the following
> message:
>
> note: multiple positive outcomes within groups encountered.
> note: 7307 groups (18043 obs) dropped because of all positive or
> all negative outcomes.
For the xtlogit question: where for certain individuals the outcome is
always 1 or always 0, the fixed effect for that individual predicts the
outcome perfectly. That implies a log-odds-ratio of +/- infinity, which
Stata's various *logit commands correctly refuse to estimate (and cope
by dropping the observations).
Re the xtprobit question:
see e.g. http://www.stata.com/statalist/archive/2008-09/msg01081.html
Brendan
--
Brendan Halpin, Department of Sociology, University of Limerick, Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F1-009 x 3147
mailto:[email protected] ULSociology on Facebook: http://on.fb.me/fjIK9t
http://teaching.sociology.ul.ie/bhalpin/wordpress twitter:@ULSociology
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/