Hanson, Samuel; Pesaran, Mohammad Hashem; Schuermann, Til - 2005
assumptions regarding the structure of systematic and idiosyncratic risks and the nature of firm heterogeneity. The theoretical … portfolio weights. In either case, neglecting parameter heterogeneity can lead to underestimation of expected losses. But, once … expected losses are controlled for, neglecting parameter heterogeneity can lead to overestimation of risk, whether measured by …