Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
st: Large standard error, Cox PH
From
Lee Savage <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: Large standard error, Cox PH
Date
Fri, 27 Jul 2012 19:20:06 +0100 (BST)
I have estimated a Cox PH model using a small sample (n=19, 347 months at risk). For one of my covariates I have found a large hazard ratio (77.01) with a correspondingly large standard error (56.61). I have seen this before but every time the covariate was insignificant, in the current model the covariate is significant (p=.001). I have tested the covariates for collinearity and everything looks fine. I think the probable cause is the small sample size.
So my question is: is this a problem for my model overall model? My inclination is to report the model as it is and just state that the significant effect for the covariate in question should be treated with extreme caution, perhaps even ignored.
I'd appreciate any advice on this.
Thanks.
*
* 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/