Table 8.
Results of Cochran’s Q test for the roughness parameters on the end face of the AZ91D magnesium alloy, λs = 20° tool.
| λs = 20° End Face of the AZ91D | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Cochran’s Q Test | ||||||||||
| Roughness Parameter | vc 400 vs. 1200 | fz 0.05 vs. 0.3 | ||||||||
| Mean | Mean | Test * | df | p-Value | Mean | Mean | Test * | df | p-Value | |
| Ra | 2.3714 | 1.3818 | 3.4085 | 4.100354 | 0.026035 | 0.8712 | 1.786 | -5.9069 | 4.583435 | 0.00265 |
| Rz | 13.128 | 6.412 | 4.3650 | 4.022686 | 0.011865 | 4.166 | 7.97 | -4.6056 | 4.361437 | 0.008121 |
| RSm | 0.1196 | 0.1716 | −1.0226 | 4.590582 | 0.357305 | 0.1014 | 0.2248 | -3.6712 | 4.409552 | 0.018011 |
| Rsk | 0.334 | −0.3034 | 3.5067 | 4.432405 | 0.020918 | 0.05 | 0.2152 | -0.7847 | 4.105744 | 0.475401 |
| Rku | 2.9146 | 2.2392 | 1.6676 | 4.217333 | 0.167024 | - | - | - | - | - |
* Test with independent variance estimation.