Bookmark and Share

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: collapsed categorical data analysis


From   brendan.halpin@ul.ie (Brendan Halpin)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: collapsed categorical data analysis
Date   Tue, 22 May 2012 15:45:12 +0100

On Tue, May 22 2012, Douglas Levy wrote:

> Hi,
> I have data describing individuals' purchases across three categories,
> X, Y, and Z. The data are expressed as percentages. Outcomes for
> person i at time t are Pr(Y=1)[it], Pr(X=1)[it], and Pr(Z=1)[it]. The
> three probabilities sum to 1. What is the best way to see if the
> distribution of purchases changes from one time period to another? 

Maarten Buis's -fmlogit- sounds like what you are asking for,
particularly if you have multiple covariates. Fractional multinomial
logit. Try -ssc install fmlogit- and explore the help.

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:brendan.halpin@ul.ie    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/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index