from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. The property of having positive kurtosis.


from Wiktionary, Creative Commons Attribution/Share-Alike License

lepto- +‎ kurtosis


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  • A somewhat bemused discussion of this condition, hitherto thought to have been confined to statisticians and economists, may be found here .

    And since bilby is rumored to be back, the mnemonic diagram mentioned in my previous comment is below:

    November 18, 2010

  • If a probability function is similar to the standard normal 'bell curve', but has fatter tails, it is said to exhibit leptokurtosis, or to be leptokurtic. A distribution showing the opposite behavior, that is, a greater than normal concentration of the probability mass in the center of the distribution range, with corresponding thinner tails is said to be platykurtic, or to exhibit platykurtosis.

    A useful mnemonic is to think of the fat-tailed distribution as having a strong tail, like that of a kangaroo, which is a good leaper, and is thus leptokurtic. The curve which concentrates more probability in the center has a silhouette closer to that of the platypus, and is therefore platykurtic.

    April 26, 2008