I have a problem finding how to use prior.weights or weights options when performing a stepwise GAM analysis (gam and step.gam functions) for covariate inclusions. Thanks beforehand for references or help on how to handle these 2 options. -- Paul Baverel, MSc, PhD student Div. of Pharmacokinetics and Drug Therapy, Dept. of Pharmaceutical Biosciences, Faculty of Pharmacy Uppsala University Box 591 SE-751 24 Uppsala Sweden ******************** Office phone: +46 (0)18 - 471 - 00- 00 Mobile phone: +46 (0)7 - 395 - 481 - 77 paul.baverel at farmbio.uu.se