search for: biofor2

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 : # numerical expression has 150 elements: only the first used #3: In OLDWDLD:DISTWOOD : #...