Difference between revisions of "Variance"
(Created page with "The <b> variance </b> of a data set is a measure of how "spread out" the data points are in general. ==Formula== ===Population=== For a dataset <math>X = \{ x_1, x_2, x_3, \d...") |
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Because of <b>Bessel's correction</b> the variance if <math>X</math> is a [[sample]] is calculated according to the slightly different formula <cmath>V = \frac{1}{n-1}\sum_{i=1}^n (x_i - \overline{x})^2.</cmath> | Because of <b>Bessel's correction</b> the variance if <math>X</math> is a [[sample]] is calculated according to the slightly different formula <cmath>V = \frac{1}{n-1}\sum_{i=1}^n (x_i - \overline{x})^2.</cmath> | ||
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Latest revision as of 18:16, 3 March 2022
The variance of a data set is a measure of how "spread out" the data points are in general.
Formula
Population
For a dataset with mean the formula for variance if is a population is Additionally, where is the population standard deviation.
Sample
Because of Bessel's correction the variance if is a sample is calculated according to the slightly different formula
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