Table 2 Statistical analysis for ABC and ABC-PSO FE techniques.

Mean

0.8224

0.1100

1.0536

0.6811

0.8295

0.1101

0.9536

0.1584

Variance

8.56 × 10^− 5

0.0001

0.1262

0.1516

3.3 × 10^− 6

2.8 × 10^− 6

0.0068

0.0129

Skewness

0.8291

0.5982

0.3469

0.3782

− 0.1106

− 0.013

0.0095

1.0509

Kurtosis

141.406

121.6949

0.4598

0.3309

5.5313

8.0587

0.8741

2.1452

Pearson correlation coefficient

− 0.006

0.0006

0.0161

0.0039

− 0.022

0.0138

− 0.031

0.0177

Sample entropy

11.486

11.4866

11.4868

11.4868

5.4085

4.8492

8.0715

8.9687

Kolmogorov complexity³⁶

11.486

11.4828

11.4862

11.4861

3.3306

2.9359

8.072

8.9682

Hijroth parameters–complexity mobility³⁷

1.5029

0.0218

1.7137

0.1133

1.7093

0.2790

1.5901

0.6632

1.4819

0.8648

1.67

0.3165

1.6063

0.1163

1.4854

0.8699

Higuchi fractal dimension³⁸

1.9993

2.0007

2.0006

2.0093

1.9811

1.9979

2.0081

1.9982

CCA

0.0721

0.1084

0.1256

0.1597