kurtosis

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kurtosis

[kər′tō·səs]
(statistics)
The extent to which a frequency distribution is concentrated about the mean or peaked; it is sometimes defined as the ratio of the fourth moment of the distribution to the square of the second moment.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

kurtosis

see MEASURES OF DISPERSION.
Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000