Sample Size Calculator

All methods

Survival / time-to-event

Use when the outcome is the time until an event and observation is censored, so power depends on the number of events accrued rather than on the number of subjects enrolled.

4 methods

Survival / time-to-event

  1. 20 Log-rank test
  2. 21 Survival non-inferiority — Schoenfeld
  3. 22 Freedman method
  4. 23 Non-proportional hazards