Table 1.

Conditional type I error and power of single-stage standard (unstratified) and stratified designs with n = 53 for (p₀₁, p₀₂, Δ) = (0.65, 0.75, 0.15) and (α^*, 1 − β^*) = (0.1, 0.9). The standard design has a fixed critical value ā = 41.

m1	Unstratified		Stratified			m1	Unstratified		Stratified
	α	1 − β	a	α	1 − β		α	1 − β	a	α	1 − β
0	0.2961	0.9947	44	0.0606	0.9215	27	0.0869	0.9081	41	0.0869	0.9081
1	0.2852	0.9939	44	0.0569	0.9142	28	0.0823	0.9011	41	0.0823	0.9011
2	0.2746	0.9930	44	0.0535	0.9065	29	0.0780	0.8938	41	0.0780	0.8938
3	0.2641	0.9919	43	0.0972	0.9517	30	0.0738	0.8862	41	0.0738	0.8862
4	0.2540	0.9908	43	0.0920	0.9467	31	0.0699	0.8782	41	0.0699	0.8782
5	0.2440	0.9896	43	0.0870	0.9414	32	0.0661	0.8699	41	0.0661	0.8699
6	0.2343	0.9882	43	0.0822	0.9357	33	0.0625	0.8612	41	0.0625	0.8612
7	0.2249	0.9866	43	0.0776	0.9296	34	0.0590	0.8523	41	0.0590	0.8523
8	0.2157	0.9849	43	0.0733	0.9232	35	0.0557	0.8430	41	0.0557	0.8430
9	0.2067	0.9830	43	0.0691	0.9163	36	0.0526	0.8334	40	0.0961	0.9049
10	0.1980	0.9810	43	0.0651	0.9091	37	0.0496	0.8236	40	0.0913	0.8981
11	0.1895	0.9787	43	0.0614	0.9015	38	0.0468	0.8134	40	0.0867	0.8909
12	0.1813	0.9763	43	0.0578	0.8935	39	0.0441	0.8029	40	0.0822	0.8835
13	0.1734	0.9736	43	0.0544	0.8851	40	0.0415	0.7922	40	0.0780	0.8757
14	0.1656	0.9707	42	0.0969	0.9368	41	0.0391	0.7812	40	0.0739	0.8677
15	0.1582	0.9676	42	0.0919	0.9311	42	0.0367	0.7699	40	0.0701	0.8593
16	0.1510	0.9642	42	0.0870	0.9250	43	0.0346	0.7584	40	0.0664	0.8506
17	0.1440	0.9606	42	0.0823	0.9186	44	0.0325	0.7467	40	0.0628	0.8417
18	0.1373	0.9566	42	0.0779	0.9119	45	0.0305	0.7347	40	0.0594	0.8325
19	0.1308	0.9525	42	0.0736	0.9048	46	0.0287	0.7225	40	0.0562	0.8230
20	0.1245	0.9480	42	0.0696	0.8973	47	0.0269	0.7102	39	0.0955	0.8886
21	0.1185	0.9432	42	0.0657	0.8895	48	0.0252	0.6977	39	0.0908	0.8813
22	0.1127	0.9382	42	0.0620	0.8813	49	0.0237	0.6850	39	0.0864	0.8738
23	0.1071	0.9328	42	0.0585	0.8727	50	0.0222	0.6722	39	0.0820	0.8659
24	0.1017	0.9271	42	0.0551	0.8638	51	0.0208	0.6592	39	0.0779	0.8578
25	0.0966	0.9211	41	0.0966	0.9211	52	0.0195	0.6462	39	0.0739	0.8495
26	0.0916	0.9148	41	0.0916	0.9148	53	0.0182	0.6330	39	0.0701	0.8408