Hi, this one comes up from time to time so I thought I’d devote a whole post to it. The question is: what is conditional probability? And here’s what I wrote: Everyone agrees that P(A,B) = P(A|B)*P(B). The question is, what comes first? In traditional probability textbooks, P(A,B) is defined first, then P(A|B) is defined […] The post 1 cool trick for defining conditional probability appeared first on Statistical Modeling,…