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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