- Jan 16, 2014
So I'm going through High Yield Behavioral Science 4th edition. On page 121 there is a equation for positive predictive value. It's basically true positive/ (true positives + false positive). The equation is 160/(160+40). It should equal 160/200= 80%. Instead it says that the equation equals 160/240 which equals 66.7%. Is this an error or am I missing something?