Case Based Reasoning using K-Nearest Neighbor with Euclidean Distance for Early Diagnosis of Personality Disorder

A personality disorder is a condition of person with an extreme that causes the sufferer to have unhealthy and different thoughts patterns behavior from other people. The disorders discussed in this study consisted 110 diseases 300 case data 68 symptoms. Based on Basic Health Research (Riskesdas) 2018 data, it shows more than 19 million people aged 15 years over were affected by mental-emotional disorders. Data Statistics Indonesia 2019 population around 265 people, while according Indonesian Clinical Psychologist Association, number verified professional psychologists 1,599 clinical out total membership 2,078 as January 2019. However, figure does not meet standards World Organization (WHO), which serve 30 thousand This still lacks 28,970 psychologists. unequal distribution has made need long time provide diagnosis because patients being inversely proportional availability Indonesia. Moreover, there enough patient knowledge about symptoms they feel. aims produce system for diagnosing based reasoning solve problems occurred previous cases using K-Nearest Neighbor classify closest distance calculation Euclidean Distance. Algorithm testing used Confusion Matrix test. results 60 K-nearest Distance score K=3, known 100% similarity disorder. Meanwhile, new 10 base was also conducted showing 9 had case, another 90% case.