Re: st: clogit interpretation

[Ron�n Conroy <rconroy@rcsi.ie>]

On 5 Beal 2006, at 16:39, Julia Gamas wrote:

> Hi all,
> I'm trying to make sure that my interpretation of my
> clogit coefficient results is correct.  My basic
> question is: do the signs reported in the clogit refer
> to the impact that a given variable has on overal
> utility OR on the utility of one choice as compared to
> the other?

Use the -or- option to see odds ratios. These have a sensible  
interpretation. The odds ratio is the change in the odds of the  
outcome for a one-unit increase in the predictor. An odds ratio  
greater than one means that the predictor increases the odds, less  
than one it decreases the odds and, if it is one, or not  
significantly different to one, it has no observed impact.

I don't know why -clogit- defaults to unexponentiated output when - 
logistic- gives exponentiated (odds ratio) output by default. I never  
met anyone who could interpret the untransformed coefficients but who  
was sane in all other respects.

=========
Ron�n Conroy
rconroy@rcsi.ie
+353 (0) 1 402 2431
+353 (0) 87 799 97 95
www.flickr.com/photos/ronanconroy




*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/