Evaluation of Parameters Affecting Magnetic Abrasive Finishing on Concave Freeform Surface of Al Alloy via RSM Method

Table 5

Regression model coefficients and lack of fit in primary and modified models.

⁢Modified model		⁢Initial model		Terms
Coefficient regression	value	Coefficient regression	value
41.06	0.000	41.57	0.000	Constant
	0.709		0.725
	0.000		0.000
	0.000		0.000
2.35	0.000	2.35	0.000
—	—		0.512
—	—		0.229
—	—	0.29	0.53
	0.004		0.013
—	—		0.95
	0.001		0.003
—	—	0.66	0.30
—	—		0.81
	0.002		0.005
	0.000		0.000
—	0.655	—	0.553	Lack of fit