Table 4.

Simulation results. We report the proportion of simulated trials in which N was declared superior (inferior) to C, and the average sample size. The correct decision is indicated in boldface. Reported figures are based on 5,000 simulated trials.

	Primary		Salvage		Average
Design	Sup.	Inf.	Sup.	Inf.	Sample Size
Scenario 1 (Complete Null)
Traditional	0.022	0.025	0.022	0.025	99.7
Stratified PO	0.022	0.025	0.020	0.025	99.8
Stratified NPO	0.029	0.028	0.029	0.032	99.5
Scenario 2 (Partial Null - PO)
Traditional	0.509	0.000	0.509	0.000	95.5
Stratified PO	0.774	0.000	0.038	0.017	94.9
Stratified NPO	0.763	0.000	0.048	0.022	93.7
Scenario 3 (Partial Null - PO)
Traditional	0.417	0.000	0.417	0.000	96.6
Stratified PO	0.040	0.015	0.784	0.000	96.5
Stratified NPO	0.047	0.016	0.782	0.000	95.4
Scenario 4 (Complete Alternative - PO)
Traditional	0.978	0.000	0.978	0.000	74.7
Stratified PO	0.841	0.000	0.850	0.000	87.4
Stratified NPO	0.842	0.000	0.853	0.000	84.6
Scenario 5 (Partial Null - NPO)
Traditional	0.215	0.001	0.215	0.001	98.5
Stratified PO	0.314	0.001	0.032	0.019	98.9
Stratified NPO	0.347	0.001	0.043	0.025	98.0
Scenario 6 (Partial Null - NPO)
Traditional	0.239	0.001	0.239	0.001	98.3
Stratified PO	0.036	0.019	0.462	0.000	98.7
Stratified NPO	0.042	0.021	0.503	0.000	97.7
Scenario 7 (Complete Alternative - NPO)
Traditional	0.710	0.000	0.710	0.000	92.1
Stratified PO	0.387	0.000	0.528	0.000	96.6
Stratified NPO	0.434	0.000	0.584	0.000	94.8