> So you're saying that 10% of time it says there's no bug? ;) No. Recall the wording: "They said it catches 60% of bugs and has 30% false alarms. Those are di

> So you're saying that 10% of time it says there's no bug? ;) No. Recall the wording: "They said it catches 60% of bugs and has 30% false alarms. Those are different measurements, the sum of true positives and false positives doesn't need to add up to 100%." Hence (nitpicking perhaps): 100%-60%=40% of the bugs (their estimation) are not caught (false negatives) The rate of false positives is 30%, that is if a particular code excerpt has no bugs it might be tagged as buggy. Thus the final error rate I guess is (actual probability of a bug)60% + (1- (actual probability of a bug))30%.