I have 3 set of items:
sample1 -> #trump: 25, #hilary: 0, #hillarycrooked: 2, ... sample2 -> #hilary: 1, #notmypresident: 15, #trump: 0, ... sample3 -> #obama: 5, #tcot: 10, #hilary: 0, ...
I wanted to use the chi-square test to see how my sample2 and sample3 are similar to my sample1. So I wanted to compare the result of the chi-squared(sample1,sample2) opposed to chi-squared(sample1, sample3) where sample1 would have been my expected values.
The problem is that the expected value may sometime be equal to 0 (so not applicable with the chi square test). What other statistical tool can I use to reach my purpose knowing that my expected and observed data may be <= 0