IBk classifier: k = 5 === Error on training data === Correctly Classified Instances 439 87.6248 % Incorrectly Classified Instances 62 12.3752 % Mean absolute error 0.1238 Root mean squared error 0.3518 Relative absolute error 35.3627 % Root relative squared error 84.1702 % Total Number of Instances 501 === Confusion Matrix === a b <-- classified as 69 44 | a = >50K 18 370 | b = <=50K === Error on test data === Correctly Classified Instances 413 82.4351 % Incorrectly Classified Instances 88 17.5649 % Mean absolute error 0.1756 Root mean squared error 0.4191 Relative absolute error 49.727 % Root relative squared error 99.3508 % Total Number of Instances 501 === Confusion Matrix === a b <-- classified as 53 63 | a = >50K 25 360 | b = <=50K