0:00:00.134,0:00:02.916 So just to make life a little more complicated, 0:00:02.916,0:00:06.683 let's recall that we talked about things like true positives. 0:00:06.683,0:00:09.955 False positives and false negatives. 0:00:09.955,0:00:12.925 Notice I left out true negatives because Kate and 0:00:12.925,0:00:16.225 I couldn't quite agree what it would mean in this example. 0:00:16.225,0:00:19.744 But we can generalize that these, these three words, these three expressions to 0:00:19.744,0:00:22.805 a confusion matrix with more than two concepts positive and negative. 0:00:22.805,0:00:26.769 We have seven different concepts, as in this example over here. 0:00:26.769,0:00:29.400 Tell me for the concept, Tony Blair. 0:00:29.400,0:00:33.040 What you think is the number of true positives