[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

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

From   Richard Williams <>
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?

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: Richard.A.Williams.5@ND.Edu

* For searches and help try:

© Copyright 1996–2017 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index