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...o be precise). So what appears to be a measure of residual error is really just a measure of how far the fitted probabilities are from 0.5!" My questions are: 1) Is residual deviance / df an appropriate measure of dispersion for binary data? (it seems to be widely used) 2) If I understand P. Daldaard's comment correctly, and it is not, what is the appropriate way? Many thanks to all who have asked and anwered questions in the past - it is of great assistance. Chris -- W.C.Oosthuizen Mammal Research Institute Department of Zoology & Entomology University of Pretoria Pretoria South Afri...