A Self-Adaptive Fuzzy c-Means Algorithm for Determining the Optimal Number of Clusters

Table 10

The value of clustering validity index on SD1.

2	0.221693	0.443390	44.592968	0.693390
3	0.206035	0.198853	40.264251	0.726245
4	0.127731	0.093653	26.220200	0.655550
5	0.130781	0.069848	27.154867	0.651465
6	0.144894	0.050067	22.922121	0.639325
7	0.136562	0.040275	29.126152	0.636258
8	0.112480	0.032874	24.323625	0.627442
9	0.115090	0.026833	24.242580	0.624936
10	0.141415	0.022611	28.574579	0.616701
11	0.126680	0.019256	28.821707	0.611524
12	0.103178	0.016634	23.931865	0.605990
13	0.110355	0.013253	26.517065	0.588246
14	0.095513	0.011083	23.635022	0.576808
15	0.075928	0.009817	19.302095	0.562289
16	0.066025	0.008824	17.236138	0.557990
17	0.054314	0.007248	14.995284	0.544341
18	0.045398	0.006090	13.208810	0.534882
19	0.039492	0.005365	11.977437	0.527131
20	0.034598	0.004917	10.835952	0.517481