[R] gam - Extraction of nonparametric component

From: Michael A. Milligan <pakdke_at_yahoo.com>
Date: Mon, 10 Mar 2008 10:36:56 -0700 (PDT)


I am estimating a semiparametric partial linear model using gam of the form


where y is the dependent variable, f1(x1) and f2(x2) are nonparametric functions of the independent variables x1 and x2, respectively, and beta and X are vectors of coefficients and independent variables. The R code is

EqGamAS <- gam(y ~ X+s(x1)+s(x2))

My question is, how can I extract the fitted values of, say, f1(x1)? Of course fitted(EqGamAS) returns the fitted values of the entire regression function, but is there a way to view only one component of the nonparametric part of the estimation? I have looked through documentation and help archives and have not found the answer. I appreciate very much any help anyone can give me.

Michael Milligan
Doctoral Candidate
University of New Mexico

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