Skip to main content

Table 3 Restricted maximum likelihood (REML) analysis with Kenward–Roger p values for phenol removal

From: Optimization of phenol adsorption from synthetic wastewater by synthesized BiFeO3 perovskite material, using split-plot central composite design

Source

Term df

Error df

F value

P value

Remark

Whole plot

2

15.00

59.13

 < 0.0001

significant

a-pH

1

15.00

63.69

 < 0.0001

 

a2

1

15.00

54.57

 < 0.0001

 

Subplot

7

15.00

10.85

 < 0.0001

Significant

B-Time

1

15.00

6.68

0.0207

 

C-Dosage

1

15.00

6.812

0.0196

 

aB

1

15.00

33.31

 < 0.0001

 

aC

1

15.00

1.87

0.1917

 

BC

1

15.00

3.52

0.0802

 

B2

1

15.00

22.48

0.0003

 

C2

1

15.00

1.39

0.2569