<![CDATA[The heart is a vital organ of the body that has an important role in the process of blood flow. Data mining is a process to get very useful information from a very large data warehouse to facilitate the decision-making process. In the data mining process, the first stage performs data processing called preprocessing by handling data formatting. Then, the feature selection stage is carried out using the Information Gain Ratio and Particle Swarm Optimization algorithms to find the best attributes. Then the Adaboost Ensemble was applied to optimize the accuracy results. Next, it is done by classifying the dataset. The algorithm used for classification is the C4.5 algorithm. Based on the research that has been done, using the k-fold = 5 model test with three trials, the best accuracy results are obtained for the C4.5 algorithm without feature selection and the Adaboost Ensemble produces an accuracy rate of 95.87%, while the C4.5 algorithm with Information Gain Ratio and Particle Swarm Optimization then applying the Adaboost Ensemble produces an accuracy rate of 96.68%. This shows that the feature selection algorithm, namely, Information Gain Ratio and Particle Swarm Optimization by applying the Adaboost Ensemble is considered to be able to improve the performance of the C4.5 classification algorithm.]]>
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