The confusion matrix obtained calculate the accuracy,
sensitivity and specificity measures [15]. The matrix denotes
samples classified as true, others as false and others
misclassified. Evaluation of the confusion matrix shows that
J48, REPTREE and SIMPLE CART show a prediction
model of 89 cases with a risk factor positive for heart
attacks. The techniques strongly suggest that data mining
algorithms are able to predict a class for diagnoses. The
confusion matrix clearly categorizes the accuracy of the
mode. The matrix validates the effectiveness of the model.
Table II and Table III shows classification accuracy based
on different techniques applied, which proves the best
classification technique to be J48, REPTREE and SIMPLE
CART algorithm perform similar in this data set, while
Bayes Net algorithm out-performed the Naïve Bayes
algorithm.