rwg: An assessment of within-group interrater agreement.

Schmidt and Hunter (1989) critiqued the within-group interrater reliability statistic (r wg ) described by James, Demaree, and Wolf (1984). Kozlowski and Hattrup (1992) responded to the Schmidt and Hunter critique and argued that r wg is a suitable index of interrater agreement. This article focuses on the interpretation of r wg as a measure of agreement among judges' ratings of a single target. A new derivation of r wg is given that underscores this interpretation