[R] natural cubic splines

[Joshua Wiley]

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 Ondřej 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/