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Kurtosis
 

Kurtosis is the degree of 'peakedness' of a continuous distribution. It is calculated from the formula:

kurtosis equation

The '3' is included in the formula to give the normal distribution a kurtosis of zero (some published versions do not include it).

A distribution with a kurtosis greater than zero is more peaky than a normal distribution and is 'Leptokurtic'. A distribution that is flatter than a normal distribution is 'Platykurtic'.

 

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