CORTENExample
If a feature appears in 24 of 40 past observations, the observed rate is 60%. The 95% Wilson interval, roughly 44.60%–73.65%, is much wider than that single number suggests.
FREE TOOL · RUNS IN YOUR BROWSER
Sample interval
calculator
Read a historical percentage together with its sample size. The 95% Wilson interval shows the uncertainty; it does not give a result for a future match.
Short answer
The sample interval calculator gives the 95% Wilson confidence interval of an observed rate: 24 out of 40 (60%) has an interval of about 44.60%–73.65%. The smaller the sample, the wider the interval. It does not correct biased or missing data and does not tell you the result of a single future match.
Past observation counts
LOCAL CALCULATIONObserved rate—
95% Wilson interval—
Sample size—
Enter whole numbers; the number of occurrences cannot exceed the total.
Limits
The interval summarises the sampling uncertainty of the observations. It does not fix biased or missing data, and it does not tell you the result of a single future match.
Sample size guide ↗Other tools
Poisson score probability ↗Odds ↔ probability converter ↗1X2 probability and margin ↗Odds movement ↗Try it on real data
Cortenscore members see past-match percentages together with the number of matches they were calculated from.
Last updated: 28 October 2026 · Responsible: Cortenscore editorial team · Spotted an error? Report a correction. This page is for statistics education; it is not a prediction or betting advice. Example values are synthetic.