variance
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| variance [2025/09/30 14:19] – [다른 공식] hkimscil | variance [2025/09/30 14:23] (current) – [Read more] hkimscil | ||
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| & = & \displaystyle \frac{\sum (X_i^2) - N * \mu^2}{N} \nonumber \\ | & = & \displaystyle \frac{\sum (X_i^2) - N * \mu^2}{N} \nonumber \\ | ||
| & = & \displaystyle \frac{\sum (X_i^2)}{N} - \mu^2 \\ | & = & \displaystyle \frac{\sum (X_i^2)}{N} - \mu^2 \\ | ||
| - | & = & E(X-\mu)^{2} = E(X^{2})-E(X)^{2} \; | + | & = & E(X^{2})-E(X)^{2} \; |
| \end{eqnarray} | \end{eqnarray} | ||
| Line 103: | Line 103: | ||
| < | < | ||
| + | > set.seed(1) | ||
| > a <- rnorm2(100000000, | > a <- rnorm2(100000000, | ||
| > a.mean <- mean(a) | > a.mean <- mean(a) | ||
| Line 114: | Line 115: | ||
| </ | </ | ||
| - | See also [[Standard Deviation]] \\ | + | 더 자세한 것은 |
variance.1759209598.txt.gz · Last modified: by hkimscil