c:ms:2018:schedule:week03
Differences
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| Both sides previous revisionPrevious revision | |||
| c:ms:2018:schedule:week03 [2018/03/20 23:37] – hkimscil | c:ms:2018:schedule:week03 [2018/03/20 23:39] (current) – [Central Tendency] hkimscil | ||
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| * 모집단변량(전집) $ \sigma^2 $ | * 모집단변량(전집) $ \sigma^2 $ | ||
| * [[:Standard Deviation]] 표준편차 | * [[:Standard Deviation]] 표준편차 | ||
| + | * Variance calculation formula | ||
| + | * {{anchor: | ||
| + | * $ \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 $ | ||
| * [[:Degrees of Freedom]] N-1 | * [[:Degrees of Freedom]] N-1 | ||
| * [[:Why n-1]] | * [[:Why n-1]] | ||
c/ms/2018/schedule/week03.1521589036.txt.gz · Last modified: by hkimscil