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...nding to does xi +yi <- c(0,2,14,19,30) # number of mice responding to dose xi mi <- rep(40, 5) # number of mice exposed summary(lmI <- glm(cbind(yi, mi -yi) ~ xi, family = binomial)) signif(cooks.distance(lmI), 3)# ~= Ci in Table 3, p.184 ####### Both are against the R svn trunk, r54122, and are attached, but may not make it through the mailing list filters. All the best, Gavin -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building,...