The unsupervised machine learning algorithm identifies three clusters of data https://www.bankofcanada.ca/?p=222421 Sum of squared error Number of clusters 9591.7272351 6352.9601022 4651.2419223 4032.7408834 3574.3350725 3205.1785976 2918.3739347 2703.8296358 2522.9604919 2344.24010910