XIE, XIANCHAO; GENG, ZHI - In: Scandinavian Journal of Statistics 36 (2009) 2, pp. 185-203
Collapsibility means that the same statistical result of interest can be obtained before and after marginalization over some variables. In this paper, we discuss three kinds of collapsibility for directed acyclic graphs (DAGs): estimate collapsibility, conditional independence collapsibility and...