Table 5.

Summary results of cohesion index

K value	SSE $\times$ 109	SSB $\times$ 109
3	0.5	5.3
4	2.6	3.1
5	1.8	4.0
6	2.1	3.8
7	1.0	4.7
8	3.6	2.0
9	1.4	4.5
10	0.2	5.5
11	3.5	2.2
12	3.8	2.0
13	1.1	4.8
14	1.0	4.9
15	2.4	3.4
16	1.4	4.4
17	2.7	3.1