Censored survival concordance
Compare risk-score ordering only among pairs with an observed earlier event.
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Use 2–300 synthetic rows and positive times. Higher risk score predicts earlier events. Pairs with equal observed times are excluded under this explicit convention.
The starting values are hypothetical. Results update as you edit. Use aggregate or synthetic inputs only.
Calculation results
- Comparable pairs
- 4
- Concordant pairs
- 4
- Tied-risk pairs
- 0
- Concordance
- 1
How to interpret the output
A pair is comparable when its earlier observed time is an event. Correct score ordering gets one, tied scores one half. This unweighted Harrell-style index can be biased by censoring; it is not Uno IPCW concordance. Equal-time pairs are all excluded, including event/censor ties, so software with different tie rules may differ.
Method referenceSource checked 2026-11-06. Read the reproducible calculator validation report.