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Table 4 Analysis of variance for mean roughness depth Ra (µm) (reduced quadratic model)

From: Application of response surface methodology for prediction and modeling of surface roughness in ball end milling of OFHC copper

Source DF Sum of squares Adj. mean square F value p value Cont. % Remarks
Regression 12 0.7068 0.05890 1068.48 0.000   Significant
Linear 4 0.3425 0.08564 1553.50 0.000   
f z 1 0.0051 0.00510 92.59 0.000 0.72 Significant
a p 1 0.0126 0.01260 228.64 0.000 1.78 Significant
a e 1 0.3243 0.32434 5883.60 0.000 45.81 Significant
V c 1 0.0005 0.00050 9.15 0.007 0.07 Significant
Square 4 0.3539 0.08850 1605.34 0.000   
fz × fz 1 0.1032 0.10320 1872.09 0.000 14.58  
ap × ap 1 0.0828 0.08284 1502.82 0.000 11.69  
ae × ae 1 0.1612 0.16117 2923.69 0.000 22.77  
Vc × Vc 1 0.1165 0.11649 2113.11 0.000 16.46  
Interaction 4 0.0103 0.00257 46.00 0.000   
fz × ae 1 0.0076 0.00766 138.89 0.000 1.07  
fz × Vc 1 0.0018 0.00181 32.77 0.000 0.25  
ap × ae 1 0.0003 0.00031 5.56 0.030 0.04  
ae × Vc 1 0.0005 0.00051 9.18 0.007 0.07  
Error 18 0.0009 0.00005     
Lack-of-fit 12 0.0008 0.00068 2.39 0.146   Not significant
Pure error 6 0.0002 0.00003     
Total 30 0.7078      
      R 2   0.9986
      \( {R}_{adj.}^2 \)   0.9977