Survival Analysis Calculator
Kaplan-Meier survival estimation with confidence intervals
About Survival Analysis
The Kaplan-Meier estimator calculates survival probabilities from time-to-event data, handling censored observations (incomplete follow-up).
Data Format: Enter one observation per line as "time,status" where:
- time = time to event or censoring
- status = 1 (event occurred) or 0 (censored/still at risk)
Key Concepts:
- Survival Function S(t): Probability of surviving beyond time t
- Median Survival: Time at which S(t) = 0.50
- Censoring: When outcome is unknown (lost to follow-up, study ends)