survival
Kaplan–Meier + log-rank
Compare survival curves between groups.
Requirements
- time variable
- event indicator
- group
Avoid when
- need covariate adjustment
- non-proportional hazards without alternatives
Formula
Ŝ(t) = Π(tᵢ≤t) [1 − dᵢ/nᵢ]
Interpretation
Log-rank p-value tests curve equality across groups.
Worked example
Compare time-to-event curves between two treatment groups.
Open example datasets