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Revision as of 02:57, 23 September 2001

A moment about the mean (also known as a central moment) is... what exactly is a moment about the mean?


  • The first moment about the mean is the mean.
  • The second moment about the mean is variance.
  • The third moment about the mean is skewness.
  • The fourth moment about the mean is kurtosis.


It is possible to define fifth, sixth and any higher order moments as well; but only the first four commonly have names.


The kth central moment of a distribution is defined as:

μk = E(x-xmean)k

where E(x) is the expected value of x.