Table 4 Fit summary for FCCCD for adsorption of Congo red results.

From: Eco-friendly approach for biosorption of Pb2+ and carcinogenic Congo red dye from binary solution onto sustainable Ulva lactuca biomass

Lack of fit tests

Source

Sum of Squares

df

Mean Square

F-value

P-value

Prob > F

Linear

18,419.02

37

497.81

255.66

 < 0.0001*

2FI

15,136.50

27

560.61

287.91

 < 0.0001*

Quadratic

107.87

22

4.90

2.52

0.1062

Sequential model sum of squares

Source

Sum of Squares

df

Mean Square

F-value

P-value

Prob > F

Linear vs Mean

4417.41

5

883.48

2.11

0.0822

2FI vs Linear

3282.53

10

328.25

0.74

0.6854

Quadratic vs 2FI

15,028.63

5

3005.73

717.42

 < 0.0001*

Model Summary Statistics

Source

Standard deviation

R-Squared

Adjusted R-Squared

Predicted R-Squared

PRESS

Linear

20.47

0.19332

0.1017

0.0066

22,698.94

2FI

21.11

0.33698

0.0445

− 0.2600

28,790.69

Quadratic

2.05

0.99468

0.9910

0.9843

358.04

  1. “* Significant values, df : degree of freedom, PRESS: sum of squares of prediction error, two factors interaction: 2FI”.
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