. 2020 Jun 27;20(13):3617. doi: 10.3390/s20133617

Table 3.

Metrics for performance analysis.

MAE	MSE	RMSE	R $^{2}$
$\frac{1}{N} \sum_{i = 1}^{N} \| y_{i} - \hat{y_{i}} \|$	$\frac{1}{N} \sum_{i = 1}^{N} {(y_{i} - \hat{y_{i}})}^{2}$	$\sqrt{\frac{1}{N} \sum_{i = 1}^{N} {(y_{i} - \hat{y_{i}})}^{2}}$	$1 - \frac{\sum {(y_{i} - \hat{y_{i}})}^{2}}{\sum {(\hat{y_{i}} - \bar{y})}^{2}}$

$y : P M \underline{} r e f e r e n c e, \hat{y} : P M \underline{} c a l i b r a t e d, \bar{y} : P M \underline{} m e a n o f r e f e r e n c e$ .