As mixture regression models increasingly receive attention from both theory and practice, the question of selecting the correct number of segments gains urgency. A misspecification can lead to an under- or oversegmentation, thus resulting in flawed management decisions on customer targeting or...

This study examines empirically whether corporate ratings by the credit ratingagency Standard & Poor’s reflect fundamental and publicly observable shocks tothe credit quality of companies. This serves to assess the degree of informationsensitivity of external ratings, and the timeliness of...