Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A quantity indicating how sharply a probability distribution function increases and decreases around the distribution's mean.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun statistics A measure of "peakedness" of a probability distribution, defined as the fourth cumulant divided by the square of the variance of the probability distribution.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek kurtōsis, bulging, curvature, from kurtoun, to make bulge, from kurtos, convex; see sker- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek κύρτωσις ("bulging, convexity"), from κυρτός (kurtos, "bulging").

Examples

Comments

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  • Distributions with long tails are called leptokurtic; distributions with short tails are called platykurtic. Normal distributions have zero kurtosis.

    David M. Lane et al., Introduction to Statistics (I don't see the date), p. 669

    April 7, 2018