Prediction and Analysis of Engine Friction Power of a Diesel Engine Influenced by Engine Speed, Load, and Lubricant Viscosity

Table 5

General factorial regression: FP versus speed, load, and viscosity.

(a) Factor information

Factor	Levels	Values
Speed	2	1000, 2000
Load	3	50, 200, 350
Viscosity	2	11.0, 14.5

(b) Analysis of variance

Source	DF	Adj SS	Adj MS	value	value
Model	11	356.141	32.376	47.62	0.000
Linear	4	262.786	65.696	96.62	0.000
Speed	1	188.104	188.104	276.65	0.000
Load	2	68.244	34.122	50.18	0.000
Viscosity	1	6.438	6.438	9.47	0.010
2-way interactions	5	92.847	18.569	27.31	0.000
Speed load	2	85.872	42.936	63.15	0.000
Speed viscosity	1	6.752	6.752	9.93	0.008
Load viscosity	2	0.223	0.112	0.16	0.850
3-way interactions	2	0.509	0.254	0.37	0.696
Speed load viscosity	2	0.509	0.254	0.37	0.696
Error	12	8.159	0.680
Total	23	364.301

(c) Model summary

	-sq	-sq (adj)	-sq (pred)
0.824578	97.76%	95.71%	91.04%

(d) Fits and diagnostics for unusual observations

Obs	FP	Fit	Resid	Std Resid
7	7.020	8.400	−1.380	−2.37
24	9.780	8.400	1.380	2.37

large residual.