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Re: st: SPOST prchange command for mlogit model


From   Richard Williams <Richard.A.Williams.5@ND.Edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: SPOST prchange command for mlogit model
Date   Mon, 24 Jul 2006 18:43:27 -0400

At 09:49 AM 7/24/2006, David Quinn wrote:
The problem is that "prchange" will not generate one standard deviation
changes in probabilities for the dichotomous IVs.  I cannot seem to
figure out how to do this.  Am I missing something, or is there an
alternative method?  I need to be able to do this because I need to be
able to compare the effects of all IVs using the same standard.  If I
present one standard deviation probability changes for all ordinal and
continuous IVs and min to max changes for the dichtomous IVs, the
ranking of the relative effect of each IV does not coincide with what
the standardized odds ratios are telling me.
What you want to do is generally frowned upon because it is impossible for a dichotomous IV to increase by 1 standard deviation.

Nonetheless, if you absolutely positively want to do it anyway, just change the coding of the dichotomy from 0-1 to 1-2. (But don't let anybody know I told you that. :) )


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Richard Williams, Notre Dame Dept of Sociology
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