IC Wilson (proporção)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
Wilson
About this calculator
The Wilson's Interval Calculator for proportion is a useful tool for estimating confidence intervals for proportions in samples. It is based on the Wilson's formula, which is an asymmetric approximation to calculate confidence intervals.
This calculator is particularly useful when working with small or large proportions, where the Wilson's formula provides a more accurate estimation of the confidence interval compared to the binomial Wilson's formula.
To use this calculator, you need to provide the estimate of the proportion (p̂), the sample (n) and the confidence level (1 - α). Additionally, it is essential to consider common precautions when working with confidence intervals, such as choosing the significance level and interpreting the results.
Frequently asked questions
What is the confidence level?
The confidence level is the probability that the confidence interval contains the true population proportion. A common confidence level is 95%
Why use the Wilson's formula?
The Wilson's formula provides a more accurate estimation of the confidence interval, especially when the proportion is small or large
What is the estimate of the proportion (p̂)?
The estimate of the proportion (p̂) is the proportion observed in the sample
How to choose the significance level?
The significance level depends on the study and analysis, but a common level is 5%.