Optimization of K Value in Clustering Using Silhouette Score (Case Study: Mall Customers Data)

Heti Mulyani (Politeknik Enjinering Indorama)
Ricak Agus Setiawan (Politeknik Enjinering Indorama, Purwakarta, Indonesia)
Halimil Fathi (Politeknik Enjinering Indorama, Purwakarta, Indonesia)

Journal of Information Technology and its Utilization
Vol 6 No 2 (2023): December 2023

Clustering is an important phase in data mining. The grouping method commonly used in data mining concepts is using K-Means. Choosing the best value of k in the k-means algorithm can be difficult. In this study the technique used to determine the value of k is the silhouette score. Then, to evaluate the k-means model uses the Davies Bouldin Index (DBI) technique. The best DBI value is close to 0. The parameters used are total consumer income and spending. Based on the results of this study it can be concluded that the silhouette score method can provide a k value with optimal results. For mall customer data of 200 data, the most optimal silhouette score is obtained at K = 5 with a DBI = 0.57.