R help - Apr 2007 - How to choose the df when using GAM function?

Dear all,
   
  When using GAM function in R, we need to specify the degree of freedom for the
smooth function (i.e. s=(x, df=#)). I am wondering how to choose an appropriate
df.
   
  Thanks a lot,
  Jin
  ----
  North Carolina State University
  USA

 
---------------------------------


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Assumed you are using the gam package developed by Hastie, you might
use step.gam() to do so.

On 4/2/07, Jin Huang <crystal_huangjin at yahoo.com.cn>
wrote:
> Dear all,
>
>   When using GAM function in R, we need to specify the degree of freedom
for the smooth function (i.e. s=(x, df=#)). I am wondering how to choose an
appropriate df.
>
>   Thanks a lot,
>   Jin
>   ----
>   North Carolina State University
>   USA
>
>
> ---------------------------------
>
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
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>

-- 
WenSui Liu
A lousy statistician who happens to know a little programming
(http://spaces.msn.com/statcompute/blog)

>   When using GAM function in R, we need to specify the degree of freedom
> for the smooth function (i.e. s=(x, df=#)). I am wondering how to choose an
> appropriate df.
--- you could use the gam function in package mgcv. It will select the 
effective degrees of freedom for you automatically using GCV or (generalized) 
AIC.

Simon

-- 
> Simon Wood, Mathematical Sciences, University of Bath, Bath, BA2 7AY UK
> +44 1225 386603  www.maths.bath.ac.uk/~sw283