The Application of Response Surface Methodology in the Investigation of the Tribological Behavior of Palm Cooking Oil Blended in Engine Oil

Table 9

Analysis of variance for wear rate.

Source	DF	Seq SS	Adj SS	Adj MS	value	value
Regression	9	0.456675	0.456675	0.009888	173.19	0.000
Linear	3	0.198500	0.198500	0.024624	431.29	0.000
Square	3	0.236568	0.236568	0.005015	87.84	0.000
Interaction	3	0.021607	0.000073	0.000024	0.43	0.742
Residual error	5	0.054272	0.000285	0.000057
Lack of fit	3	0.051876	0.000285	0.000095	6486.86	0.000
Pure error	2	0.002396	0.000000	0.000000
Total	14	0.510947

= 0.0330377, PRESS = , = 95.99%, (pred) = %, and (adj) = 83.96%.