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Re: st: -bs- with the xi: prefix and -gologit2-


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu
Subject   Re: st: -bs- with the xi: prefix and -gologit2-
Date   Fri, 29 Feb 2008 09:03:53 -0500

At 08:31 AM 2/29/2008, Sara Mottram wrote:
Please forgive this basic question. I'm not very confident with bootstrapping.

I am trying to get an estimate of bias in the regression coefficients from a partial proportional odds model that I have fitted using -gologit2-. A colleague tells me that she has previously obtained an estimate of bias from the -logit- function using -bs- in Stata 7. I can replicate this (with -logit-) as long as I don't have any indicator variables (i.e. I don't use the xi: prefix) in Stata 9.2. However, the output I get when I use -bs- with -gologit2- doesn't make much sense, I get too many sets of coefficients (5, when I only 3 levels to my dependent variable - see output below).
I've never used bootstrap with gologit2 before (in fact I have rarely used bootstrap with anything), and I am tied up for most of the day, so if anyone else wants to field this question they are welcome! Otherwise I will look at it more carefully later.

One quick observation - the output is very hard to read on my screen (the line breaks are all screwed up) so I may be missing something, but it looks to me like you are getting 2 sets of coefficients, one for "None" and another for "Mild." What makes you say you are getting 5 sets?


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Richard Williams, Notre Dame Dept of Sociology
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EMAIL: Richard.A.Williams.5@ND.Edu
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