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.
Cheers,
Josh
2011/5/4 Ond?ej Mikula <onmikula at 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 Mikula
>
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--
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/