[R] Seeking Code for Chaid or Similar

[Daniel Folkinshteyn]

on 08/27/2008 09:26 AM David Cobey said the following:
>     I'm interested in modifying a regression tree algorithm to use the
> difference between a control and a dosed sample as its dependent variable.
> I was wondering if anyone knew where I could find code to implement a basic
> chaid algorithm.  Is it possible to access the code inside of R?  Is there
> another place I can find the basic algorithm already coded.

don't know about your specific target, but as a general question of 
seeing the code: to see a function's code in R, just type its name at 
the prompt without parentheses - that will show the code, rather than 
invoke the function.