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Table 4
Analysis of variance (multi-factor ANOVA) for change in surface roughness (ΔRa).
| Source | DF | Seq SS | Contribution (%) | Adj SS | Adj MS | F-Value | P-Value |
|---|---|---|---|---|---|---|---|
| Material, M | 2 | 0.027811 | 3.11 | 0.002045 | 0.001023 | 0.64 | 0.539 |
| Abrasive powder, A | 1 | 0.000461 | 0.05 | 0.013297 | 0.013297 | 8.38 | 0.011 |
| Morphology of magnetic particles, µ | 1 | 0.274176 | 30.65 | 0.247690 | 0.247690 | 156.07 | 0.000 |
| Rotational Speed, R | 1 | 0.044974 | 5.03 | 0.048164 | 0.048164 | 30.35 | 0.000 |
| Machining Time, T | 1 | 0.099094 | 11.08 | 0.047813 | 0.047813 | 30.13 | 0.000 |
| M*A | 2 | 0.009777 | 1.09 | 0.033044 | 0.016522 | 10.41 | 0.001 |
| M * µ | 2 | 0.184972 | 20.68 | 0.122638 | 0.061319 | 38.64 | 0.000 |
| M * R | 2 | 0.031364 | 3.51 | 0.042992 | 0.021496 | 13.54 | 0.000 |
| M * T | 2 | 0.113124 | 12.65 | 0.142135 | 0.071067 | 44.78 | 0.000 |
| A * µ | 1 | 0.045842 | 5.12 | 0.027357 | 0.027357 | 17.24 | 0.001 |
| A * R | 1 | 0.001511 | 0.17 | 0.000003 | 0.000003 | 0.00 | 0.968 |
| A * T | 1 | 0.026057 | 2.91 | 0.030904 | 0.030904 | 19.47 | 0.001 |
| µ * R | 1 | 0.005862 | 0.66 | 0.008312 | 0.008312 | 5.24 | 0.037 |
| µ * T | 1 | 0.003319 | 0.37 | 0.003903 | 0.003903 | 2.46 | 0.138 |
| R * T | 1 | 0.002419 | 0.27 | 0.002419 | 0.002419 | 1.52 | 0.236 |
| Error | 27 | 0.023806 | 2.66 | 0.023806 | 0.001587 | ||
| Total | 47 | 0.894570 | 100.00 |
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