Equation 2
\begin{equation} \text{MDPE}_{\text{i\ }}(\%)=median\ \{\text{PE}_{\text{ij}},\ j=1,\ldots,\ N_{i}\}\nonumber \\ \end{equation}
To assess inaccuracy (i.e. size of the typical miss) median absolute prediction error (MDAPE) was determined with Equation 3.