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Re: st: How can I compare two Cox models - can I use Harrell's C/ROC curves?


From   Ronan Conroy <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: How can I compare two Cox models - can I use Harrell's C/ROC curves?
Date   Wed, 21 Jan 2009 16:51:11 +0000

On 21 Ean 2009, at 04:33, Zoe Hyde wrote:

I have used estat con to obtain Harrell's C for both models, and there doesn't seem to be a lot of difference - 0.69 for one model and 0.67 for the other. However, I'd feel more comfortable if there was some way I could test the significance of the difference. Is there is test I can use to compare these two results?

These don't look like clinically useful models. Whether or not they are statistically significantly different, they aren't clinically significantly different.

What happens when you put both in the same model?


Ronan Conroy
=================================

[email protected]
Royal College of Surgeons in Ireland
Epidemiology Department,
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http://rcsi.academia.edu/RonanConroy

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