History of Variance

	Revision 22 . . (edit) December 6, 2001 10:05 pm by (logged).153.190.xxx
	Revision 21 . . (edit) December 6, 2001 10:04 pm by (logged).153.190.xxx
	Revision 20 . . September 23, 2001 8:18 pm by Zundark [mention that it is the second moment about the mean]
	Revision 19 . . (edit) June 30, 2001 4:05 pm by Larry Sanger

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Difference (from prior major revision) (minor diff, author diff)

Changed: 1c1

The variance of a set of data is the mean squared deviation from the Arithmetic Mean of the same set of data. Because this calculation sums the squared deviations, we can conclude two things:

The variance of a real-valued random variable is its second central moment. So the variance of a set of data is the mean squared deviation from the arithmetic mean of the same set of data. Because this calculation sums the squared deviations, we can conclude two things:

Removed: 7d6

Changed: 11,13c10

:see also standard deviation back to statistical dispersion

See also: standard deviation, mean, skewness, kurtosis, statistical dispersion