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distrmod
2010 Jul 21
3
Interactions in GAMMs
Hi,
I've an issue adding an interaction to a GAMM:
My model was of form:
gamm1 <- gamm(TOTSR ~ fROT + s(PH) + s(LOI) + s(ASP) + s(SQRT_ELEV) + CANCOV
+ s(SQRT_TOTCWD) + s(WELLF) + s(WELLN) + s(OLDWDLD) + s(DISTWOOD) +
s(Annprec) + s(OLDWDLD:DISTWOOD) + (1|fSITE), family = poisson, data =
BIOFOR2)
with interaction of s(OLDWDLD:DISTWOOD).
However I got this error message below but don't know what it means? (my
data is composed of info for 150 plots)
#I Warning messages:
#2: In OLDWDLD:DISTWOOD :
# nume...
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 s...