I'm comparing two groups A, B after cross tabulating them with cases and controls.
I get a table as such:
A 8 0
B 14 0
Obviously, I can't do an odds ratio because of the 0's. Doing a Fisher's exact test gives me a p-value of 0.5152 but the confidence interval goes from 0.16 to Infinity.
Adding .5 to each cell doesn't change Fisher's exact test (although I'm not sure why the ODD's ratio is still infinite in R) and I'm hesitant to use a normality approximation due to the small cell counts.
However, the signal seems to be quite strong that A and B both act the same... Neither of them are push an observation into the "case" category. (Here A & B are toxic substances).
What would be some other ways I can tackle this to get this point across?