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Re: st: Predicted probabilities after mlogit


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Predicted probabilities after mlogit
Date   Mon, 05 Sep 2005 10:34:16 -0500

At 10:10 AM 9/5/2005, Little, Allan wrote:
Dear all,

I'm trying to calculate predicted probabilities following a multinomial logit regression. My dependant variable has three states - employment (coded 0), unemployment (1) and inactivity (2).

I would like to calculate the predicted probability, firstly evaluated at the mean, and secondly evaluated a number of different specified values. However, I am encountering some apparent inconsistencies according to which command I use.

1. If I use 'predict p0 p1 p2 if e(sample)' [option 'pr' is assumed to be the default]. The predicted probabilities are equivalent to the proportion (sample mean) for each category.
Perhaps some output or at least the actual commands would help. Are you saying that, for every case, the predicted probabilities are the same for each category? I'm not totally clear on what you are doing, since predict is going to give you values for individual cases whereas prvalue gives you a few summary statistics.


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Richard Williams, Notre Dame Dept of Sociology
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