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Table 1 Power to reject H0 in a two-stage design with α0 = 0.5 (combination of t tests, one-sided, α = 0.05)

From: Adaptive designs based on the truncated product method

δ =

0.1

0.2

0.3

0.4

0.5

25 observations per group in stage one, 75 observations per group in stage two

Ď„ = 1

0.149

0.343

0.595

0.808

0.929

Ď„ = 0.5

0.153

0.352

0.605

0.815

0.931

50 observations per group and stage

Ď„ = 1

0.162

0.377

0.644

0.854

0.959

Ď„ = 0.5

0.165

0.384

0.652

0.860

0.961

75 observations per group in stage one, 25 observations per group in stage two

Ď„ = 1

0.166

0.386

0.654

0.860

0.962

Ď„ = 0.5

0.167

0.389

0.657

0.863

0.963