Figà Talamanca,A., Guerriero, A., Leone, A., Mignoli, G.P. and Rogora, E. 2007. Decomposition of variance in terms of conditional means. Statistica. 67, 2 (Jan. 2007), 191–201. DOI:https://doi.org/10.6092/issn.1973-2201/3504.