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I am feeling my way in the use of GLM's and have come across a warning whilst manually simplifying a model with interaction terms, removing terms one at a time from the maximum model (R1.9.0). > model<-glm(midpnts~(AET+tempave+tempvar+MDE+sqrtarea)^2+Lat,family=poisson,weights=weightS) > model2<-update(model,~.-tempave:tempvar) Warning message: fitted rates numerically 0 occurred in: glm.fit(x = X, y = Y, weights = weights, start = start, etastart = etastart, I have had limited success in interpreting this...