Biørn, Erik - Økonomisk institutt, Universitetet i Oslo - 2010
unobserved heterogeneity potentially affecting both health status and ability to work, which can bias inference because the … attaching unobserved heterogeneity to non-structured fixed effects? In the paper we examine this issue and discuss the … other hand by correlation between unobserved heterogeneity in health status and in ability to work. We show that running …