In probability theory and statistics, the variance is a measure of how far a set of numbers is spread out. It is one of several descriptors of a probability distribution, describing how far the numbers lie from the mean (expected value).

In particular, the variance is one of the moments of a distribution. In that context, it forms part of a systematic approach to distinguishing between probability distributions.

While other such approaches have been developed, those based on moments are advantageous in terms of mathematical and computational simplicity. ( Read more > Comments )

Spanish ~ Español - varianza


100812 ~ About the Variance

The variance is a parameter describing in part either the actual probability distribution of an observed population of numbers, or the theoretical probability distribution of a sample (a not-fully-observed population) of numbers.

In the latter case a sample of data from such a distribution can be used to construct an estimate of its variance: in the simplest cases this estimate can be the sample variance.
MBA Horace Clestown

Wikipedia: Variance (external link)

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