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Table 5 Analysis of Variance for MRR after dropping insignificant factors and interactions

From: Processing of Al2O3–SiCw–TiC ceramic composite by powder mixed electric discharge grinding

Source

DF

Seq SS

Adj SS

Adj MS

F

P

Regression

10

0.0016964

0.0016964

0.0001696

37.862

0.000000

Residual error

21

0.0000941

0.0000941

0.0000045

  

Lack-of-Fit

16

0.0000844

0.0000844

0.0000053

2.733

0.135556

Pure error

5

0.0000097

0.0000097

0.0000019

  

Total

31

0.0017905

    
  1. DF Degree of freedom, SS Sum of squares, MS Mean square
  2. R-Sq = 94.75%; R-Sq(pred) = 87.74%; R-Sq(adj) = 92.24%
  3. F > F0.01,10,21
  4. Flack of fit < F0.01,16,21
  5. Model is not adequate (F0.01,10,21 = 3.37)
  6. Lack of fit is insignificant (F0.01,16,21 = 3.03)