In the article by Beaulieu et al. (2020), the authors found a small error in equations 10, 11, and 12. In error an, A + symbol was added to the first element of the equations at the right of the =symbol. Such +should not be there. The correct equations are as follows:

$${\widehat{r}}_g=\frac{{\widehat{r}}_a\sqrt{{\widehat{\sigma }}_{a1}^2{\widehat{\sigma }}_{a2}^2}+{\widehat{r}}_d\sqrt{{\widehat{\sigma }}_{d1}^2{\widehat{\sigma }}_{d2}^2}}{\sqrt{\left({\widehat{\sigma }}_{a1}^2+{\widehat{\sigma }}_{d1}^2\right)\left({\widehat{\sigma }}_{a2}^2+{\widehat{\sigma }}_{d2}^2\right)}}$$

$${\widehat{r}}_p=\frac{{\widehat{r}}_a\sqrt{{\widehat{\sigma }}_{a1}^2{\widehat{\sigma }}_{a2}^2}+{\widehat{r}}_e\sqrt{{\widehat{\sigma }}_{e1}^2{\widehat{\sigma }}_{e2}^2}}{\sqrt{\left({\widehat{\sigma }}_{a1}^2+{\widehat{\sigma }}_{e1}^2\right)\left({\widehat{\sigma }}_{a2}^2+{\widehat{\sigma }}_{e2}^2\right)}}$$ (with model [8],)

$${\widehat{r}}_p=\frac{{\widehat{r}}_a\sqrt{{\widehat{\sigma }}_{a1}^2{\widehat{\sigma }}_{a2}^2}+{\widehat{r}}_d\sqrt{{\widehat{\sigma }}_{d1}^2{\widehat{\sigma }}_{d2}^2}+{\widehat{r}}_e\sqrt{{\widehat{\sigma }}_{e1}^2{\widehat{\sigma }}_{e2}^2}}{\sqrt{\left({\widehat{\sigma }}_{a1}^2+{\widehat{\sigma }}_{d1}^2+{\widehat{\sigma }}_{e1}^2\right)\left({\widehat{\sigma }}_{a2}^2+{\widehat{\sigma }}_{d2}^2+{\widehat{\sigma }}_{e2}^2\right)}}$$ (with model [9])