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Re: st: collapsed categorical data analysis

From (Brendan Halpin)
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 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    ULSociology on Facebook:         twitter:@ULSociology
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