Step-down testing procedures for the Hotelling $T^2$ problem are considered. It is shown that the classical step-down procedure proposed by S. N. Roy, R. E. Bargmann and J. Roy is inadmissible among invariant procedures (for a suitable invariance group) in many situations, including all those for which more than two steps are contemplated. It is also noted that in most cases, the power of the step-down procedure decreases in at least one of the noncentrality parameters over part of the parameter space. Finally, several alternative admissible step-down procedures are proposed.
@article{1176347497,
author = {Marden, John I. and Perlman, Michael D.},
title = {On the Inadmissibility of Step-Down Procedures for the Hotelling $T^2$ Problem},
journal = {Ann. Statist.},
volume = {18},
number = {1},
year = {1990},
pages = { 172-190},
language = {en},
url = {http://dml.mathdoc.fr/item/1176347497}
}
Marden, John I.; Perlman, Michael D. On the Inadmissibility of Step-Down Procedures for the Hotelling $T^2$ Problem. Ann. Statist., Tome 18 (1990) no. 1, pp. 172-190. http://gdmltest.u-ga.fr/item/1176347497/