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This is a seemingly simple problem - hopefully someone can help. Problem: we have two integers. We want (1) all the common factors, and (2) all the possible products of these factors. We know how to get (1), but can't figure out a general way to get (2). Example: 40 and 80 have these factors: c(1,2,2,2,5) and c(1,2,2,2,2,5). We can use match() to get the common factors c(1,2,2,2,5). What

I am trying to do logistic regression with a categorical predictor variable with the glm() function, family=binomial. Using glm() I would like to be able to calculate the confidence intervals of all three possible odds ratios for a factor (the factor has three categories). Three categories imply two columns of 0's and 1's in the design matrix, and two parameter estimates with their