RFM Model and K-Means Clustering Analysis of Transit Traveller Profiles: A Case Study

Table 5

The cost of training as the number of clusters increases.

Number of clusters (k)	The diminishing return
	2018	2019
1	29,000	40,000
2	7,500	9,500
3	3,300	4,000
4	2,500	2,500
5	2,000	1,800
6	1,500	1,300
7	1,000	1,000
8	750	750
9	650	650
10	500	500