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...s and each choice set has a variable number of alternatives (one of which is chosen) see data below. Many Thanks, David PS I have asked earlier but without reply. Is it because: a. it's a stupid question b. It's obvious c. No one knows the answer Data: > Chosen AttrQ AttrW | Choices set 1 > 0 8 0 | > 1 20 34 | > 0 7 2 | > > 0 5 3 | set 2 > 0 3 5 | > 1 25 18 | > 0 4...

I want to maximize a conditional likelihood function that is basically logistic conditional on the number of successes within strata. What would be a good starting place for this? A complication is that the denominator includes a term that is the sum over all permutations. Although there is no time dimension to the problem, it's possible a degenerate use of the Cox proportional hazards