I am trying to use the CART in a survival analysis. I have three variables of
interest (all 3 ordinal - x, y and z, each of them with 5 categories) from
which I want to make smaller groups (just an example 1st category from X
variable with the 2nd and 3rd categories from the Y category and 2, 3 and 4
categories from the Z category etc) based on their, let's say, association with
mortality.
Now I would also want that this analysis to be adjusted for a number of
variables (that I don't want to incorporate in the decision tree, just to take
them into consideration in the relationship between the 3 variables and the
outcome; I would also want to mention that for this confounders I have missing
values - how should this be deal with?), this survival analysis to be
stratified and also to use clusters.
I have tried party and rpart packages, but I don't seem to get how to properly
do what I want.
Thank you
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