Table 5. Sample size calculation for the one-sided triangular test.

	one-sided						two-sided
	Pa = 0.18		Pa = 0.20		Pa = 0.25		Pa = 0.20
Stage	N per group	Cumulated information Z statistic	N per group	Cumulated information Z statistic	N per group	Cumulated information Z statistic	N per group	Cumulated information Z statistic
1	8	27	7	23	5	16	8	27
2	16	55	14	47	10	31	16	53
3	24	82	20	67	14	44	24	80
4	32	110	27	90	19	60	32	107
5	40	137	34	113	23	72	40	133
6	48	165	40	133	28	88	48	160
7	56	192	47	157	32	101	56	187
8	64	220	54	180	37	117	64	213
9	72	247	60	200	41	129	72	240
10	80	274	67	223	46	145	79	263

pa = 0.18, 0.20 and 0.25; and two-sided test, pa = 0.20.