Variance

Variance {Measures of Uncertainty} (Distribution Theory) (GWU EMSE-271)
Index | Topics (Logical Lectures) | Lectures | Problems | Readings | References

Variance is average squared distance from mean (weighted squared value). Units are squared. Standard deviation is square root of variance; more useful units. - Dr. Mazzuchi, EMSE 271 lecture.

"The (population) **variance** of a random variable is a non-negative number which gives an idea of how widely spread the values of the random variable are likely to be; the larger the variance, the more scattered the observations on average." - [|Statistics Glossary]

[ Generalized Variance ]


 * Sources:**
 * EMSE 271, Fall 2009 (Slides 42)
 * EMSE 280, Spring 2009
 * [|Statistics Glossary] v1.1 (STEPS) - Valeried J. Easton and John H. McColl