Table 8 Comparative results of SDPSO entropy and purity with k-means, GA, DBSCAN and hybrid PSO-GA for the five datasets

k-means

0.32

0.74

0.24

0.79

0.12

0.86

0.15

0.89

0.34

0.69

GA

0.15

0.82

0.18

0.84

0.29

0.69

0.11

0.88

0.38

0.61

DBSCAN

0.09

0.92

0.16

0.79

0.12

0.88

0.21

0.77

0.35

0.71

Hybrid PSO-GA

0.10

0.89

0.21

0.88

0.16

0.86

0.10

0.92

0.34

0.71

SDPSO

0.06

0.97

0.25

0.85

0.13

0.91

0.08

0.95

0.30

0.73