[R] gam error

From: natalieh <fbsnch_at_leeds.ac.uk>
Date: Thu, 03 Jun 2010 04:24:39 -0700 (PDT)

Hi all,

I'm trying to use a gam (mgcv package) to analyse some data with a roughly U shaped curve. My model is very simple with just one explanatory variable:

m1<-gam(CoT~s(incline))

However I just keep getting the error message

"Error in smooth.construct.tp.smooth.spec(object, dk$data, dk$knots) :   A term has fewer unique covariate combinations than specified maximum degrees of freedom"

Just wondering if anyone had come across this before/ could offer any advice on where the problem might lie

Many thanks,

Natalie

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