[R] Additional Documentation for rpart?

[Clayton Springer]

Dear r-help,

I am looking for additional documentation on the "adj" column in rpart's
splits matrix.  The help says:

adj
         gives the adjusted concordance for surrogate splits

I am looking info about "adjusted concordance". I cannot find this phrase
in either Therneau & Atkinson original RPART documentation or the CART
book.


This question came up in the context of trying to calculate what the 
"improve" for the node would have been if surrogate split were used
instead.  So if anybody knows how to do (or extract) that would be very
helpful too.

Thanks in advance,

Clayton Springer


-- 
Clayton Springer, Ph. D.
Sandia National Laboratories                      csprin at ca.sandia.gov
Biosystems Research Department                    (925) 294-2143
P.O. Box 969, MS 9951                fax:         (925) 294-3020
Livermore, CA, 94551-0969

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