\(\overset{\overline{}}{\text{Phma}}=\frac{1}{365}\sum_{d=1}^{365}\text{Phma}_{d}\) \(\overset{\overline{}}{\text{Phma}}=\frac{1}{\text{na}}\sum_{a=1}^{\text{na}}\text{Phm}_{a}\) 1