confidence interval



  • noun a range of statistical values within which a result is expected to fall with a specific probability


  • noun a means of quantifying a margin for error in statistical analysis; the interval gives an estimated range of values for a certain unknown parameter – the wider the interval, the more likely is an error in interpreting the parameter and more data should be collected


  • An interval or range of values within which the theoretical probability of an event occurring may be specified. For instance, the probability of a failure occurring within a given time period. The wider the interval, the greater the confidence that the event will occur.

Health Economics

  • (written as Confidence Interval)
    The range of values within which a population parameter such as the population mean or variance is expected to lie with a given degree of confidence. The convention is to set the 'confidence' level at 95 per cent, in the (frequentist) sense that, with repeated sampling, 95 per cent of the values will lie in that range.