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...ion. My question - is the presence of birds affected by various hydrological parameters? Presence/absence data were collected from 83 sites and coupled against hydrological data from the same site. The bird survey sampling effort varied at each site so I want to include this as a random effect (fAVGNTS). I have also conducted a join count test which suggests that there is some spatial autocorrelation. Consequently I have used the following code: library(MASS) attach(Birds) Birds$x <- Birds$LONGITUDE Birds$y <- Birds$LATITUDE M <- glmmPQL(PRESENCE~ HYDROVAR1 + HYDROVAR2, random= ~ 1|fA...