 As a by-product of our analysis, we robustify the classical Hausman test for exogeneity against misspecification of the linear model.
<clarity>  As a by-product of our analysis, we robustify the classical Hausman test for exogeneity against misspecification of the linear model.
 As an important application of our analysis, we robustify the classical Hausman test for exogeneity against misspecification of the linear model.