[R] Smoothing Spline Basis Matrix

pinkdd rubyrd2008 at gmail.com
Tue Mar 2 02:54:16 CET 2010

Thanks, Derek.

I used your code, but H still has a lot of columns being 0. I'm not sure
I'm dealing the data http://www-stat.stanford.edu/~tibs/ElemStatLearn/
with X=age, Y=spnbmd
I think X has too many duplicated data???

I'll check the book you recommended in the library tomorrow. Thanks again.

D Sonderegger wrote:
> Close, but not quite.  Your design matrix is:
> H <- bs(X, knots=spl$fit$knot, intercept=TRUE)
> So long as you have data in all of the inter-knot regions, you should be
> ok.
> A good book to check out about this sort of thing is Ruppert, Wand and
> Carroll's Semiparametric Regression book.  I can't recommend that book
> highly enough.
> Derek

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