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Sample size for Survival analysis (logrank test)

Input
Type I error - Alpha: 
Type II error - Beta:
Survival rate Group 1: 
Survival rate Group 2: 
Ratio of sample sizes in Group 1 / Group 2: 
Result
Number of cases required in group 1:
Number of cases required in group 2:
Total sample size (2 groups together):

For details, see the MedCalc manual: Sample size: Survival analysis (logrank test).

How to cite this page

  • MedCalc Software Ltd. Sample size calculator for Survival analysis (logrank test) | MedCalc. https://www.medcalc.org/en/calc/sample-size-survival-analysis.php (Version 23.6.1; accessed July 15, 2026)
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