An Island Grouping Genetic Algorithm for Fuzzy Partitioning Problems

Table 3

Comparison of the results (in terms of the number of clusters finally found and as a function of the Rand index) obtained by the proposed GGA algorithm with MDB, XB, and FS indexes, respectively, with the previous GGA in [38] and the FCM algorithm in the second synthetic clustering problem considered.

Algorithm	Number of clusters	Rand index
Proposed GGA (MDB index)	3	0.9284
Proposed GGA (XB index)	3	0.9203
Proposed GGA (FS index)	7	0.7998
GGA from [38] (MDB index)	3	0.9177
GGA from [38] (XB index)	3	0.9128
GGA from [38] (FS index)	7	0.7606
FCM	4	0.8561