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Re: st: -bs- with the xi: prefix and -gologit2-
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?
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
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