title: Proxy interviews and bias in the distribution of cognitive abilities due to non-response in longitudinal studies: a comparison of HRS and ELSA.
authors.affiliation: University of Michigan.
authors.forename: David
authors.initials: D
authors.lastname: Weir
authors.affiliation: University of Michigan.
authors.forename: Jessica
authors.initials: J
authors.lastname: Faul
authors.affiliation: University of Michigan.
authors.forename: Kenneth
authors.initials: K
authors.lastname: Langa