Hello,
I would like, if it is possible, to compare the effect of a variable across
regression models. I have looked around but I haven't found anything. Maybe
someone could help? Here is the problem:
I am studying the effect of a variable (age) on an outcome (local recurrence:
lr). I have
David,
In the Cox and many other regression models, the effect of a variable
is context-dependent. There is an identifiability problem in what you
are doing, as discussed by
@ARTICLE{for95mod,
author = {Ford, Ian and Norrie, John and Ahmadi, Susan},
year = 1995,
title = {Model
If you just want to visualize the effect on one variable on the response from
some different models then you might try Predict.Plot from the TeachingDemos
package. It takes a little tweaking to get it to work with cph objects, but
here is a basic example (partly stolen from the help page for
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