Fuzzy Approach for Group Sequential Test

Table 1

Pocock’s critical values 𝑍_𝑝(𝐾,𝛾) and Δ for two-sided test, 𝐾=1,…,5; 1−𝛽=0.95; 𝛾=0.10.

𝐾	𝑍𝑝(𝐾,𝛾)					Δ
1	1.645					3.290
2	1.875	1.875				2.445
3	1.993	1.993	1.993			2.035
4	2.067	2.067	2.067	2.067		1.782
5	2.122	2.122	2.122	2.122	2.122	1.605