Standardized residuals \(\tilde{r}_i\) in function of leverage \(l_i\)

Given that \(\tilde{r}_i\) should have approximately standard-normal distribution, only about 0.5% of them should be larger or lower than 2.57.

If there is an excess of such observations, this could be taken as a signal of issues with the fit of the model. At least two such observations (59 and 143).