Kaplan-Meier Survival Calculator (3 intervals)
Compute cumulative survival probability at three time points using the non-parametric Kaplan-Meier estimator for a small cohort.
How to Use the Kaplan-Meier Survival Calculator (3 intervals)
- Enter number of events and number at risk for each of three intervals.
- Click Calculate to see cumulative survival at each time point.
Casos de Uso
- •Clinical trial teaching.
- •Quick cohort survival sketches.
- •Biostatistics course homework.
Fórmula
S(t) = Π(1 − d_i / n_i), where d_i is the number of events and n_i the number at risk in interval i.
Perguntas Frequentes
What is an "event"?
Usually death, but it can be any time-to-event outcome — disease progression, graft rejection, device failure, etc.
How are censored observations handled?
This simplified version assumes the "at risk" denominator already excludes those censored before each interval. Real KM curves keep patients in until their censoring time.
Medical disclaimer
Educational only. Clinical survival analysis should use a statistical package with proper censoring and confidence intervals.