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Related link : Sample Size Introduction and Explanation Page Survival - Kaplan Meier Log Rank Test Explained Page Sample Size for Survival (Kaplan Meier Log Rank Test) Explained and Tables Page

The Data for Power Estimations is in 5 columns. - Each row a separate study - Col 1 = probability of Type I error (α) - Col 2 = sample size in group 1 - Col 3 = Survival rate observed in group 1 - Col 4 = sample size in group 2 - Col 5 = Survival rate observed in group 2

Please Note: Any survival rate of 0 is defaulted to 0.0001 and 1 to 0.9999to produce an approximate result.