Kurtosis/Definition: Difference between revisions
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a mathematical expression defining the shape of a symmetrical probability distribution curve - sometimes referred to as "peakiness". It is sometimes adjusted to | a mathematical expression defining the shape of a symmetrical probability distribution curve - sometimes referred to as "peakiness". It is sometimes adjusted to put the kurtosis of a ''normal distribution'' at zero (although some mathematicians then call it "excess kurtosis"). Positive kurtosis then means that more of the ''variance'' is due to infrequent extreme deviations, rather than to frequent modestly-sized deviations. | ||
Latest revision as of 16:24, 23 May 2009
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Kurtosis [r]: a mathematical expression defining the shape of a symmetrical probability distribution curve - sometimes referred to as "peakiness". It is sometimes adjusted to put the kurtosis of a normal distribution at zero (although some mathematicians then call it "excess kurtosis"). Positive kurtosis then means that more of the variance is due to infrequent extreme deviations, rather than to frequent modestly-sized deviations.