Performance analysis of KNN classifier and K-means clustering for robust classification of epilepsy from EEG signals

Abstract

Epilepsy is a neurological disorder which affects persons of all age. The brain waves are studied for epilepsy detection. The Electroencephalogram (EEG) is the simplest diagnostic technique available for brain wave analysis. In this paper, we investigate the performance of KNN classifier and K-means clustering for the classification of epilepsy risk level from EEG signals. To identify the non linearity present in the data, detrend analysis is done. An EEG record of twenty patients is analyzed. The power spectral density is determined which is further used for dimensionality reduction. The performance index achieved by KNN classifier and K-means clustering are 78.31% and 93.02% respectively. A high Quality value of 22.37 with K-means clustering and a low value of 18.02 are obtained with KNN classifier. The results show that K-means outperforms KNN classifier in epilepsy risk level classification.