Table 1. Statistical analysis equations.

Source	Equation
Root mean square error (RMSE	$RMSE=\sqrt{\sum _{k=0}^n{\displaystyle \frac{{(P_i-O_i)}^2}{n}}}$
Mean absolute error (MAE)	MAE = n−1${\sum }_1^n\left(P_i-O_i\right)$
Percentage error (PE)	PE = $\left|{\displaystyle \frac{P_{ave}-O_{ave}}{O_{ave}}}\right|100\mathrm{\%}$
Mean ratio (MR)	MR = n−1$\sum _1^n{\displaystyle \frac{P_i}{O_i}}$
Determination coefficient (R2) (Todorovic, Karic & Pereira, 2013)	$R^2={\left\{{\displaystyle \frac{{\sum }_{i=1}^n\left(O_i-\overline{O}\right).\left(P_i-\overline{P}\right)}{\sqrt{{\sum }_{i=1}^n{\left(O_i-\overline{O}\right)}^2}.\sqrt{{\sum }_{i=1}^n{\left(P_i-\overline{P}\right)}^2}}}\right\}}^2$