Standardized regression residual
= Standardized regression residual
{title2=$e_i/[s\sqrt{1-h_{ii}}]$}
In a <normal linear model>, the $i$th <regression residual> has <variance> $\sigma^2(1-h_{ii})$, where $h_{ii}$ is a diagonal entry of the <hat matrix>. Replacing $\sigma$ by the residual standard deviation $s$ gives the standardized residual used in the normal <Q-Q plot> of R's linear-model diagnostic plots.