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StatsToDo: Sample Size for Survival (Kaplan Meier Log Rank Test) Studies

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Explanations and References Sample Size Tables Javascript Program
Sample Size Calculations: Data in 5 columns.
   - Each row a separate study
   - Col 1 = probability of Type I error (α)
   - Col 2 = power (1-β)
   - Col 3 = survival rate in grp 1
   - Col 4 = survival rate in grp 2
   - Col 5 = ratio of sample size (Ngrp 1/Ngrp 1)
Please Note: Sample size rounded to nearest whole number

Power Estimations: Data 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: Survival rate of 0 is defaulted to 0.0001
and 1 to 0.9999 to produce an approximate result.

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