Category:Definitions/Variance
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This category contains definitions related to Variance.
Related results can be found in Category:Variance.
Let $X$ be a discrete random variable.
Then the variance of $X$, written $\var X$, is a measure of how much the values of $X$ varies from the expectation $\expect X$, and is defined as:
- $\var X := \expect {\paren {X - \expect X}^2}$
That is: it is the expectation of the squares of the deviations from the expectation.
Subcategories
This category has only the following subcategory.
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Pages in category "Definitions/Variance"
The following 8 pages are in this category, out of 8 total.