Optimization of the Physical and Mechanical Properties of a Spline Surface Fabricated by High-Speed Cold Roll Beating Based on Taguchi Theory

Table 7

Significant test of work-hardening degree regression model.

Sources of variance	Sum of squares	Degrees of freedom	Complex correlation coefficient	value	value
Regression	0.013	9	0.9563	117.28	<0.0001
Residual		6
Total	0.014	15