[Retracted] Mathematical Modeling and Analysis of Wear Behavior of AlTiN Coating on Titanium Alloy (Ti-6Al-4V)

Table 4

ANOVA for COF.

Source	Sum of square	Degree of freedom	Mean square	F value	value prob > F
Model	0.100749	4	0.025187	215.370	<0.0001	Significant
A	0.001219	1	0.001219	10.4217	0.0056
B	0.002079	1	0.002079	17.7801	0.0007
AB	0.060048	1	0.060048	513.4588	<0.0001
A^2	0.037403	1	0.037403	319.82	<0.0001
Residual	0.001754	15	0.000117
Lack of fit	0.001475	10	0.000147	2.6382	0.1479
Pure error	0.000279	5	5.59 × 10^−05
Cor total	0.102503	19