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Illustration of Variance
For illustration, for the vector [4, 6, 1, 5], there are n = 4 values therefore n - 1 is 3. The mean of this data set is also 4. The variance will be
The built-in function to compute the variance is known as var:
>> shortx = [4 6 1 5];
>> myvar = var(shortx)
myvar =
4.6667
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The variance is generally defined in terms of the arithmetic mean as: At times, though, the denominator is defined as n instead of n - 1. The default definition used by t
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