significant terms in spline model using GAM

-----Original Message-----
From: Nirmal Govind [mailto:nirmalg at psu.edu]
Sent: Monday, April 21, 2003 7:24 PM
To: r-help at stat.math.ethz.ch
Subject: [R] significant terms in spline model using GAM


Hi.. I'm using gam() to fit a spline model for a data set 
that has two predictor
variables (say A and B). The results indicate that the higher 
order interaction
terms are significant. The R^2 jumps from .5 to .9 when I 
change the maximum
order for the interaction from 10 to 15 (i.e. (AB)^10 to 
(AB)^15). Is there any
way of finding out which of the terms in the model are really 
"significant" so
that I could drop some of the terms from the model?

Thanks,
nirmal