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A ready reckoner to help all performance analysts in their everyday work (03 Sep 15)

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When analysis of performance data is used to generalise in any way, it is essential to always calculate a confidence interval (CI) around each statistic.

The CI is a range of values that you can be confident (to a pre-specified level) includes the real value of the statistic for the entire population.

This could be useful if you are analysing repairs data, rent arrears…

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