Variance

DEFINATION

方差是在概率论和统计方差衡量随机变量或一组数据时离散程度的度量。

Represent

often represented by $σ^{2}$ , $s^{2}$ , $Var (X)$ , V(X), or $V (X)$

Formula

$\[S^{2} = \frac{\sum (x_{i} - \bar{x})^{2}}{n - 1} \] \[S^{2} = s a m p l e v a r i a n c e \] \[x_{i} = t h e v a l u e o f t h e o n e o b s e r v a t i o n \] \[\bar{x} = t h e m e a n v a l u e o f a l l o b s e r v a t i o n s \] \[n = t h e n u m b e r o f o b s e r v a t i o n s \]$

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Variance

DEFINATION

Represent

Formula

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