Figà Talamanca,Alessandro, Angelo Guerriero, Alberto Leone, Gian Piero Mignoli, and Enrico Rogora. “Decomposition of Variance in Terms of Conditional Means”. Statistica 67, no. 2 (January 1, 2007): 191–201. Accessed May 24, 2022. https://rivista-statistica.unibo.it/article/view/3504.