[R] rpart cutpoint interpretation

[Therneau, Terry M., Ph.D.]

The cutpoint is on the predictor, so the interpretation is the same as it is for any other 
rpart model.  The subjects with predictor < cutpoint form one group and those > cutpoint 
the other.  The cutpoint is chosen to give the greatest difference in "average y" between 
the groups.  For poisson "averge y" is an event rate.

On 10/08/2015 05:00 AM, r-help-request at r-project.org wrote:
> I am trying to derive cutpoint/threshold with a poisson distributed
> dependent variable. I know how to interpret cutpoint with binary dependent
> variable based on direction. Can some on help me to intrepret cutpoint for
> poisson case with one independent variable with the derived threshold.