"correlation between risks" vs "interaction between risks" Please can you explain the difference because I would have thought that means exactly the same?
correlation vs interaction eg I have to say with my “CA1 hat” on I’d tend to slip into using the two terms interchangeably, however, apparently they are distinct! I’ve come across this following eg (that I’ve summarised) to illustrate interaction vs correlation. Suppose considering two risk factors gender and smoker status and the stats show us that both men and women have same chance of being a smoker or non-smoker ... then we’d say gender and smoker status aren’t correlated. We then introduce a third factor of risk of getting cancer, if the data shows that: - cancer rates for women smokers are twice that of male smokers - cancer rates for women non-smokers are four times that of male non-smokers then we’d say that the level of cancer depends on the interaction between both gender and smoker status. Hope this helps!
