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Concept information

probability theory > confidence interval
mathematical statistics > confidence interval

Terme préférentiel

confidence interval  

Définition(s)

  • In frequentist statistics, a confidence interval (CI) is a range of estimates for an unknown parameter. A confidence interval is computed at a designated confidence level; the 95% confidence level is most common, but other levels, such as 90% or 99%, are sometimes used. The confidence level, degree of confidence or confidence coefficient represents the long-run proportion of CIs (at the given confidence level) that theoretically contain the true value of the parameter; this is tantamount to the nominal coverage probability. For example, out of all intervals computed at the 95% level, 95% of them should contain the parameter's true value.
    (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Confidence_interval)

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