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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)