Statalist


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

st: Covariate selection for survival analysis


From   Colleen Murphy <cmurph02@uoguelph.ca>
To   "." <statalist@hsphsun2.harvard.edu>
Subject   st: Covariate selection for survival analysis
Date   Sat, 27 Sep 2008 20:05:17 -0400 (EDT)

Hi
I have a question regarding selection of covariates for survival analysis. I have a data set from a cohort study, following a group of dogs exposed to antimicrobials for the occurrence of resistance- measuring antimicrobial resistance to specific antimicrobials at 6 discreet time intervals. My concern at the moment is that I have very small sample sizes in each of the antimicrobial cohort group. The sample size in my largest group is 39 dogs and my smallest cohort has 9 dogs. Are there any guidelines in how many covariates I can consider when doing a survival analysis even at the univariate stage (like there are for linear and logistic regression). There is a lot data available on these dogs, but given the very small sample sizes, I feel that I need to be very prudent in covariate selection for univariate and multivariable analysis. 
Thanks
Colleen
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index