Function name

Equation

Reference

Root Mean Square Error (RMSE),

$\text{RMSE}=\sqrt{{\displaystyle \sum }_{i=1}^n{\left(x_{iexp}-x_{ipred}\right)}^2/\left(n-p-1\right)}$

[27]

Averages

$\overline{X_e}=\frac{1}{n}{{\displaystyle \sum }}_{i=1}^n{x}_{iexp}$ , $\overline{X_p}=\frac{1}{n}{{\displaystyle \sum }}_{i=1}^n{x}_{ipred}$

Correlation coefficient (CC)

$\text{CC}=\sqrt{1-\frac{{{\displaystyle \sum }}_{i=1}^n{\left(x_{iexp}-x_{ipred}\right)}^2}{{{\displaystyle \sum }}_{i=1}^n{\left(x_{iexp}-\overline{X_e}\right)}^2}}$

[69]