c:ms:2017:schedule:week03
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| c:ms:2017:schedule:week03 [2018/03/19 08:46] – hkimscil | c:ms:2017:schedule:week03 [2022/05/15 11:25] (current) – [Central Tendency] hkimscil | ||
|---|---|---|---|
| Line 107: | Line 107: | ||
| * [[:Standard Deviation]] 표준편차 | * [[:Standard Deviation]] 표준편차 | ||
| - | * Variance calculation formula | + | * Variance calculation formula |
| - | * {{anchor: | + | * $ \displaystyle S_x^2 = \displaystyle \frac {\Sigma X^2 - \frac{(\Sigma X)^2}{N} } {N-1} $ |
| * $ \displaystyle \sigma_x^2 = \displaystyle \frac {\Sigma X^2 - \frac{(\Sigma X)^2}{N} } {N} = \displaystyle \frac {\Sigma X^2}{N} - \frac {(\Sigma X)^2}{N^2} = \displaystyle \frac {\Sigma X^2}{N} - \bigg(\frac {\Sigma X}{N}\bigg)^2 = \displaystyle \frac {\Sigma X^2}{N} - \mu^2 $ | * $ \displaystyle \sigma_x^2 = \displaystyle \frac {\Sigma X^2 - \frac{(\Sigma X)^2}{N} } {N} = \displaystyle \frac {\Sigma X^2}{N} - \frac {(\Sigma X)^2}{N^2} = \displaystyle \frac {\Sigma X^2}{N} - \bigg(\frac {\Sigma X}{N}\bigg)^2 = \displaystyle \frac {\Sigma X^2}{N} - \mu^2 $ | ||
c/ms/2017/schedule/week03.1521418575.txt.gz · Last modified: 2018/03/19 08:46 by hkimscil