3 ms·
You only need to control for it if the total number of infections is a significant percentage (probably somewhere around 1-5% depending on significance level) o
by m_mueller 9y ago
You only need to control for it if the total number of infections is a significant percentage (probably somewhere around 1-5% depending on significance level) of each group population - otherwise you'd have to control for anything and everything and statistical field studies would be completely impossible to allow for any conclusions (while as it is it's just really hard).
- danieltillett 9y agoThis is true, but you should at least make an effort to rule this out. The really hard thing in science is not fooling yourself by overlooking something important.