Table 2.

Statistical Parameters of GEP model for external validation.

Item	Formula	Condition	GEP CC	GEP DC
1	R	0.8 < R	0.9999	0.9997
2	$k=\left[{\sum }_{i=1}^n(h_i\times t_i)\right]/h_i^2$	0.85 < k < 1.15	0.9996	0.9994
3	$k^{{}^{\prime }}=\left[{\sum }_{i=1}^n(h_i\times t_i)\right]/t_i^2$	$0.85<k^{{}^{\prime }}<1.15$	1.0000	0.9998
4	$m=(R^2-R{o}^2)/R^2$	|m| < 0.1	-0.00036	-0.00154
5	$n=(R^2-R{o}^{{}^{\prime }2})/R^2$	|n| < 0.1	-0.00026	-0.00155
6	$R_m=R^2\times (1-\sqrt{|R^2-{Ro}^2|})$	0.5 < Rm	0.9837	0.9592
where	${Ro}^2=1-\left[{\sum }_{i=1}^n{(t_i-h_i^0)}^2\right]/\left[{\sum }_{i=1}^n{(t_i-\overline{t_i})}^2\right]$	$h_i^0=k\times t_i$	1.0000	0.9999
	$R{o}^{{}^{\prime }2}=1-\left[{\sum }_{i=1}^n{(h_i-t_i^0)}^2\right]/\left[{\sum }_{i=1}^n{(h_i-\overline{h_i})}^2\right]$	$t_i^0=k^{{}^{\prime }}\times h_i$	1.0000	1.0000