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StatsToDo: Sample Size for Phase II Studies: Gehan's Procedure

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Explanations and References Sample Size Tables Javascript Program
Data required
  • Type I Error (α, ε). The common values used are 0.05 or 0.1
  • Power (1-β). The common values used are 0.8 or 0.9
  • π. The minimum success rate for the treatment to be accepted for further development
User should replace the default example data with his/her choices

  Type I Error (α)
  Power (1-β)
  Minimum success rate acceptable (π)

R Codes