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2010 Jul 21
0
Validation in R for GAMM
My GAMM model is to find drivers of species richness in forests is gamm1<- gamm(Total Species Richness ~ fROT + s(PH) + s(LOI) + ASP + s(SQRT_ELEV) + CANCOV + s(SQRT_TOTCWD) + s(WELLF) + s(WELLN) + s(OLDWDLD) + s(DISTWOOD) + s(Annprec), random=list (fSITE =~1), family = poisson, data = BIOFOR3) My issues are that the validation graphs are using methods I'm unfamiliar with e.g. square rooting values and Pearson's residuals. I'm following as best I can recommendations in Wood 2006 and Zuur 2009 but have some (I think) basic questions on graphical validation: 1. plot sqrt tran...