de Luna, Xavier; Johansson, Per - Institutet för Arbetsmarknads- och Utbildningspolitisk … - 2001
We propose a general test for exogeneity that is robust against distributional misspecification. The test can also be used to identify other types of misspecifications, such as the presence of a random coefficient. The idea is to sort the data with respect to a variable (a sorting score) and...