I have to calculate log2 ratio for odds and don't know how to do it.
Group A Group B 0.031571 0.0170071
There are occurrences of event in
Group B - I want to calculate how much
Group A has this specific event compared to
Group B, hence I need log2 for odds ratio.
I was thinking that such ratio should be calculated like this:
log2(GroupA/GroupB) = log2(0.031571/0.0170071) = 0.892463
However in this stackoverflow answer they calculate it like this:
(GroupA/GroupB)/log(2) = (0.031571/0.0170071)/log(2) = 2.67814
My question is - how to calculate log2 ratio; and what is the difference between these two approaches?