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]
Re: st: Including age as covariate or using age-stratified estimates in stcox
From
raoul reulen <[email protected]>
To
[email protected]
Subject
Re: st: Including age as covariate or using age-stratified estimates in stcox
Date
Fri, 1 Oct 2010 09:24:24 +0100
Roland,
Do you mean attained age or age at appendectomy? I suspect that the
proportional hazard assumption was not satisfied for age. Did you
check for this?
Raoul
On 1 October 2010 07:00, roland andersson <[email protected]> wrote:
> I am analysing cause-specific mortality after appendectomy. Mortality
> is strongly related to age as is exposure to different morbidities.
> The hazard therefore varies according to age. I get substantially
> different results if I use stcox with strata(age) or include age and
> age2 as covariates. Can you help me understand the difference and the
> correct use of stratified anlysis versus including the variables as
> covariates.
>
> Roland Andersson, MD, PhD
> *
> * 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/
>
*
* 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/