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st: mlogit prchange error factor variables and time-series operators not allowed r(101);


From   Andreas Chouliaras <adhoul@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: mlogit prchange error factor variables and time-series operators not allowed r(101);
Date   Tue, 7 May 2013 16:51:41 +0200

Dear statalist,

I estimate a multinomial logit model and then I want to get the
marginal changes for the probabilities, thus I use prchange.

Then I get the following error (i.e. prchange does not execute correctly).

. prchange
factor variables and time-series operators not allowed
r(101);

Anyone had this problem before and has a suggestion on how to solve
it? Couldn't find something on the net..

Thanks a lot in advance
Best,
Andreas

P.S. : I am using Stata 12 on a Mac OS X version 10.7.5
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