Thanks for sharing the questions and responses!
Is it possible to appreciate how much the coefficients matter in one
or the other model?
Say, using Biau's example, using coxph, as.factor(grade2 ==
high)TRUE gives hazard ratio 1.27 (rounded).
As clinician I can grasp this HR as 27% relative
A coefficient of -0.4 means that survival times are multiplied by
exp(-0.4), that is, people survival only 67% as long.
-thomas
On Wed, Nov 17, 2010 at 4:32 AM, Vincent Vinh-Hung anhx...@gmail.com wrote:
Thanks for sharing the questions and responses!
Is it possible to appreciate how
Dear Prof Therneau,
thank yo for this information: this is going to be most useful for what I want
to do. I will look into the ACF model.
Yours,
David Biau.
De : Terry Therneau thern...@mayo.edu
Cc : r-help@r-project.org
Envoyé le : Lun 15 novembre 2010,
Dear Prof Lumley,
This is a very clear, precise, and useful answer to all my questions.
Thank you very much.
David Biau.
De : Thomas Lumley tlum...@uw.edu
Cc : r help list r-help@r-project.org
Envoyé le : Dim 14 novembre 2010, 23h 54min 23s
Objet : Re: [R]
Thank you David for your answer,
- grade2 is a factor with 2 categories: high and low
- yes as.factor is superfluous; it is just that it avoids warnings sometimes.
This can be overlooked.
- I will look into Terry Therneau answers; he gives a good explanation on how
to
obtain the hazard for an
On Nov 13, 2010, at 3:24 PM, Biau David wrote:
Thank you David for your answer,
- grade2 is a factor with 2 categories: high and low
So high would be 1 and low would be 2 by default (alpha ordering)
factor behavior. as.logical(grade2==high) reverses that order. If
you wanted a more
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