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energy1
2000 Jul 11
2
warnings associated with logistic regression
...ther a particular species is found at a site on
the landscape. The independent variables represent physical
characteristics of the landscape derived from a GIS. A significant
proportion of the time I get the following warning messages from
glm():
> lr <- glm(known.v1~elevation+aspect+slope+energy15+energy166+aspect+accum+streams.buffered,family=binomial,data=siteframe)
Warning messages:
1: Algorithm did not converge in: (if (is.empty.model(mt)) glm.fit.null else glm.fit)(x = X, y = Y,
2: fitted probabilities numerically 0 or 1 occurred in: (if (is.empty.model(mt)) glm.fit.null else glm.fit...