[R] mgcv: lowest estimated degrees of freedom

From: Julian Burgos <jmburgos_at_u.washington.edu>
Date: Thu, 21 Jun 2007 11:51:33 -0700


Dear list,

I do apologize if these are basic questions. I am fitting some GAM models using the mgcv package and following the model selection criteria proposed by Wood and Augustin (2002, Ecol. Model. 157, p. 157-177). One criterion to decide if a term should be dropped from a model is if the estimated degrees of freedom (EDF) for the term are close to their lower limit.

What would be the minimum number of EDF's for a) Univariate thin plate regression splines(TPRS) with shrinkage, i.e. s(...,bs="ts")
b) Bivariate tensor products of TPRS with shrinkage?

Thanks for any help,

Julian Burgos

-- 
Julian M. Burgos

Fisheries Acoustics Research Lab
School of Aquatic and Fishery Science
University of Washington

1122 NE Boat Street
Seattle, WA  98105 

Phone: 206-221-6864

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Received on Thu 21 Jun 2007 - 19:02:15 GMT

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