Table 2.

Empirical size and power for the single-stage and minimax and optimal two-stage designs listed in Table 1

		Single-Stage		Minimax		Optimal
r	Δ	Size	Power	Size	Power	Size	Power
	(α, 1 − β) = (0.05, 0.9)
30	1.4	0.043	0.881	0.044	0.876	0.046	0.874
	1.5	0.043	0.878	0.043	0.879	0.045	0.883
	1.6	0.039	0.880	0.041	0.889	0.043	0.882
	1.7	0.042	0.890	0.041	0.895	0.043	0.889
	(α, 1 − β) = (0.1, 0.9)
	1.4	0.091	0.878	0.091	0.882	0.091	0.880
	1.5	0.092	0.880	0.091	0.881	0.091	0.881
	1.6	0.093	0.893	0.091	0.887	0.087	0.879
	1.7	0.091	0.890	0.087	0.886	0.091	0.890
	(α, 1 − β) = (0.05, 0.85)
	1.4	0.044	0.827	0.044	0.834	0.044	0.827
	1.5	0.045	0.840	0.049	0.825	0.043	0.832
	1.6	0.043	0.841	0.043	0.838	0.043	0.835
	1.7	0.043	0.838	0.047	0.842	0.043	0.839
	(α, 1 − β) = (0.05, 0.9)
60	1.4	0.044	0.889	0.044	0.883	0.047	0.889
	1.5	0.043	0.890	0.045	0.888	0.043	0.887
	1.6	0.043	0.892	0.041	0.891	0.046	0.896
	1.7	0.043	0.900	0.045	0.899	0.043	0.891
	(α, 1 − β) = (0.1, 0.9)
	1.4	0.092	0.894	0.094	0.890	0.096	0.888
	1.5	0.094	0.890	0.094	0.894	0.098	0.886
	1.6	0.090	0.895	0.094	0.888	0.096	0.892
	1.7	0.092	0.901	0.092	0.896	0.093	0.891
	(α, 1 − β) = (0.05, 0.85)
	1.4	0.045	0.838	0.046	0.847	0.045	0.844
	1.5	0.045	0.844	0.046	0.843	0.045	0.846
	1.6	0.041	0.851	0.043	0.845	0.043	0.846
	1.7	0.041	0.849	0.040	0.843	0.045	0.847