On May 4, 2011, at 8:34 AM, Joshua Wiley wrote:
Hi Ondrej,
What documentation have you looked at? Does this help at all?
require(splines)
?ns
## one example
summary(lm(y ~ ns(x, df = 3),
data = data.frame(y = runif(100), x = rbinom(100, 9, .25)^2)))
## built in examples
example(ns)
Also, I am very fond of the book, Modern Applied Statistics with S by
Venables & Ripley. It has a section on splines that might help you.
Agree on that last point entirely. I understand that restricted cubic
splines are another name for natural splines (but would welcome
correction if that understanding is in error). They are used
extensively in the rms/Hmisc package combination with the supporting
text "Regression Modeling Strategies".
--
David
Cheers,
Josh
2011/5/4 Ondřej Mikula <onmik...@gmail.com>:
Dear R-helpers,
I need to fit natural cubic spline with specified number of knots. I
expected 'splines' package will be helpful, but I am confused by its
help. Is more detailed documentation available for it or could you
recommend another R function?
Best regards
Ondrej Mikuladucible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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