Fuzzy Approach for Group Sequential Test

Figure 3

Decision criteria for 𝛼-cuts approach to group sequential testing 𝐻₀∶𝜇=𝜇₀ versus 𝐻₁∶𝜇≠𝜇₀.

(a) Reject 𝐻₀ if 𝑆_𝑘>PCV₂

(b) Reject 𝐻₀ if 𝑆_𝑘<PCV₁

(c) Accept 𝐻₀ if PCV₁<𝑆_𝑘<PCV₂

(d) No decision if PCV₁≈𝑆_𝑘<PCV₂

(e) No decision if PCV₁<𝑆_𝑘≈PCV₂