Table 5 Average rankings achieved by the Friedman test for the SPEA 2a algorithm with different parameter settings

P_cross=0.45,d=1,P_mut=0.3,μ_m=0.1,σ_m=0.10

64.89

P_cross=0.45,d=1,P_mut=0.3,μ_m=0.1,σ_m=0.20

63.44

P_cross=0.45,d=1,P_mut=0.5,μ_m=0.1,σ_m=0.10

6 9 . 2 2

P_cross=0.45,d=1,P_mut=0.5,μ_m=0.1,σ_m=0.15

67.89

P_cross=0.45,d=1,P_mut=0.5,μ_m=0.1,σ_m=0.20

67.56