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Table 1 The results of applying the Šidák [15] and Armitage-McPherson [3] adjustments

From: Interim analyses of data as they accumulate in laboratory experimentation

No. of interim analyses (k)

Nominal critical

Pvalue

Adjusted critical Pvalue

  

(Šidák)

(Armitage-McPherson)

1

0.05

0.050

0.050

2

0.05

0.025

0.030

5

0.05

0.010

0.016

10

0.05

0.005

0.011

20

0.05

0.003

0.008