Table 3.

Regression coefficients of µ (β ₁) and σ (β ₂) in each of the six training sets, respectively.

Training set	β 0*	β 1	β 2	P value
ER+ (Grade 1)	−8.06E − 16	0.4601	0.7066	<0.001
ER+ (Grade 2)	3.64E − 15	0.4878	0.6846	<0.001
ER+ (Grade 3)	9.81E − 16	0.4650	0.7094	<0.001
ER− (Grade 1)	1.49E − 15	0.4273	0.7274	<0.001
ER− (Grade 2)	−2.68E − 15	0.4484	0.7199	<0.001
ER− (Grade 3)	1.20E − 15	0.4673	0.7078	<0.001

*Here, β ₀ in each training set represents very small value and so assigned β ₀ as zero.