Optimal critical values and times of intermediate testing points are determined to minimize expected sample size in a variety of situations. Two-stage and three-stage models are considered for a variety of values of power. We investigate the robustness of the optimality parameters.
No takes yet. Share an insight, caveat, or question.
Brittain et al. (1993) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: