[R] User request to ppr (projection pursuit regression, library(modreg))
kochmn at cip.mathematik.uni-stuttgart.de
Wed May 29 17:37:24 CEST 2002
I am working on a regression problem using a set of trainig data (X|Y) and
the R-function ppr() in the modreg library. I have succeeded in having
create an object B which contains the vectors B$alpha and coefficients
B$beta for the ridge functions. But now i am stuck fast. Could you please
either give me an adress to someone who knows ppr() or, if that
happens to be yourself, help me with the following two questions:
* The ridge functions ought to be of the form f_i(alpha_i*X) where the f_i
are univariate regression estimates, i.e. a nearest neighbour estimate.
Which type of estimate did you choose for your program?
* After calling B<-ppr(...) and after choosing some x<-c(x1,...,xd). How
can i make R give me a prediction for y on x?
All the best is sent to you by
E-Mail: kochmn at cip.mathematik.uni-stuttgart.de
Tel. : 0049 7191 / 68 68 110 (Germany)(assuming you are in suisse)
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