I am using Fit X by Y with categorical variables. The "positive" outcomes occurs in the intervention group 100% of the time, so I believe that when I ask for an odds ratio, it can't be calculated because the other outcome occurs 0% of the time (and so there is a 0 in the denominator).
I've read about using a small value in place of the 0, in which case I can just calculate an odds ratio by hand, but I'd like to get a 95% CI. I would think that one end of the 95% CI would be infinite...?
I see. I am not familiar with this 'trick,' so I cannot advise you. I imagine, though, that the trick assumes large counts or else it would drastically affect the estimation of the odds ratio and its interval.