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...r R-list, In the R-book, p.464, Michael Crawley recommends that error bars for bar plots of normally distributed continuous response variables with categorical explanatory variables be given by 1/2 of the least significant difference, where the least significant difference is defines as qt(0.975,degrees_of_freedom)*standard_error_of_the_difference. The idea is that the above quantity visually conveys whether or not the means are different more realistically than do standard errors. I have analyzed proportions with categorical variables using the glm function with a binomial error model. I wish to plot a b...