Nilsson, William - Institutionen för Nationalekonomi, Umeå Universitet - 2005
identical twins, this study takes advantage of the similarity within pairs of twins to separate family specific heterogeneity … whether an individual received social assistance as a measure of poverty, family specific heterogeneity explains between 24 … selection problem can occur. To deal with this problem, and also to take care of unobserved heterogeneity, a sample selection …