Bookmark and Share

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: FW: stcrreg: when the proportional hazards assumption fails


From   Steve Samuels <[email protected]>
To   [email protected]
Subject   Re: st: FW: stcrreg: when the proportional hazards assumption fails
Date   Thu, 21 Oct 2010 10:06:18 -0400

I don't see that you have a problem. You seem to have a fairly
complete model if you include the ordinal variable with the tvc() and
texp() commands, perhaps omitting the non-significant indicator. As
the Stata 11 Manual states on p 214, it is the coefficients which are
time varying.

One issue: a three-level variable would have only two indicators, not
three. Showing your code and results, as the FAQ request, would really
help avoid this kind of misunderstanding.

Steve

Steven J. Samuels
[email protected]
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax:    206-202-4783

On Thu, Oct 21, 2010 at 4:45 AM, Zoe Hyde <[email protected]> wrote:
> Hello All,
>
> I am wondering what options are available when the proportional hazards assumption doesn't hold in a competing-risks regression.  The assumption holds for my main independent variable of interest, but not for another (ordinal) variable that I'd like to adjust for; fitting it as a time-varying covariate gives a significant result for 2 of its 3 levels.
>
> I could get around this by stratifying by this variable in a standard Cox model, but this doesn't seem to be supported (yet) by stcrreg.
>
> Are there any alternatives?
>
>
> Regards,
>
> Zoe.
>
>
> Western Australian Centre for Health and Ageing (M570)
> University of Western Australia
> 35 Stirling Highway, Crawley 6009
> Western Australia
>
> Courier address:
> Level 6, Ainslie House, Royal Perth Hospital
> 48 Murray Street, Perth 6000
>
> *
> *   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/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index