R-users
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My understanding is that package "mgcv" is based on
"Generalized Additive Models: An Introduction with R (by Simon N. Wood)".
On the page 126 of this book, eq(3.4) looks a quartic equation with respect
to
"x", not a cubic equation. I am wondering if all routines which uses
cubic splines in mgcv are based on this quartic equation.
In my humble opinion, the '^4' in the first term
of the second line of this equation should be '^3'.
K. Takezawa
--
***** r.otasuke@gmail.com *****
http://cse.naro.affrc.go.jp/takezawa/intro.html
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