Figure 3-1 shows a sample confusion matrix. A confusion matrix is a 2 by 2 table showing actual values (rows) versus predicted values (columns). This figure show a sample confusion matrix. There are two values (actual and predicted) for each of buyers and non-buyers. The first cell (upper left) is the number of actual buyers that were predicted to be buyers; the value is 516. The second cell (upper right) is the number of actual buyers that were predicted to be nonbuyers; the value is 25. The third cell (lower left) is the number of actual nonbuyers that were predicted to be buyers; the value is 10. The fourth cell (lower right) is the number of actual nonbuyers that were predicted to be nonbuyers; the value 725. This confusion matrix indicates that the predictions were correct 516 + 725 = 1241 times and incorrect 25 + 10 = 35 times.