Dear R community,
I am trying to write my own user defined split function for rpart. I read
the example in the tests directory and I understand the general idea of the
how to implement user defined splitting functions. However, I am having
troubles with addressing the data frame used in calling rpart in my split
functions.
For example, in the evaluation function that is called once per node, I want
to fit a proportional odds model to the data in the node and use its
deviance as node deviance:
evalf <- function(y,x,parms) {
pomnode<-polr(dataframe$y~dataframe$x,dataframe,weights=dataframe$Freq)
more code
}
The dataframe used in the polr call should be the data of the current node.
How can I address the data of the current node and assign it to the
dataframe?
Thank you for your help,
Tobias Guennel
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