Table 8.

Descriptive statistics for interval residual

Model	Mean	Standard	Skewness	Kurtosis
		Deviation
Ordinary $\Delta$
iLR	$-$1.13×10${}^{-13}$	4.60	4.43	41.37
iRLR	$-$3.41×10${}^{-14}$	1.62	0.13	2.33
iQR	8.99×10${}^{-1}$	4.78	5.30	51.01
iETKKR	$-$8.14×10${}^{-8}$	1.42	0.19	2.81
Standardized ${\Delta }^S$
iLR	$-$2.46×10${}^{-14}$	1.00	4.43	41.37
iRLR	$-$2.11×10${}^{-14}$	1.00	0.13	2.33
iQR	1.88×10${}^{-1}$	1.00	5.30	51.01
iETKKR	$-$5.73×10${}^{-8}$	1.00	0.19	2.81