Independence, Proportions, and Relative Risk
摘要
Suppose we are researching heart attacks, and we want to know whether a person’s having diabetes “affects” their chances of having a heart attack. Another way this is frequently put is to say that we want to know whether diabetes is a “risk factor” for heart attacks. A third way is to ask if heart attacks are “independent” of diabetes status. All three questions are really asking the same thing.