> I'd like to force rpart to use a specific variable, namely "spec" as
> the first split and then allow it to proceed as usual. Is there a way
> to do this?
You can often get this effect by using the "cost" argument. Make the
variable in question have very low cost.
Terry Therneau
__
I am using the package rpart to explore various classification structures.
The call looks like:
seekhi1<-rpart(pvol~spec+a1+psize+eppres+numpt+icds+bivalcrt+stents+ppshare+
nhosp+nyrs,data=dat,method="class",
control=rpart.control(minsplit=30,xval=10))
The output is
1)
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