degrees_of_freedom
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
degrees_of_freedom [2019/09/24 12:43] – hkimscil | degrees_of_freedom [2020/04/09 05:10] – hkimscil | ||
---|---|---|---|
Line 30: | Line 30: | ||
| | Xi | ds | ds< | | | Xi | ds | ds< | ||
- | | | + | | 1 | 2 | -1 | 1 | |
- | | | + | | 2 | 3 | 0 | 0 | |
- | | | + | | 3 | 2 | -1 | 1 | |
- | | | + | | 4 | 4 | 1 | 1 | |
- | | | + | | 5 | 5 | 2 | 4 | |
- | | | + | | 6 | 5 | 2 | 4 | |
- | | | + | | 7 | 2 | -1 | 1 | |
- | | | + | | 8 | 2 | -1 | 1 | |
- | | | + | | 9 | 4 | 1 | 1 | |
- | | | + | | 10 | 1 | -2 | 4 | |
| sum | 30 | 0 | 18 | | | sum | 30 | 0 | 18 | | ||
| N | 10 | | | N | 10 | | ||
Line 69: | Line 69: | ||
* sd = 1.258306 | * sd = 1.258306 | ||
* n-1 대신 n을 사용했을 때는 0.9437293 | * n-1 대신 n을 사용했을 때는 0.9437293 | ||
- | |||
- | |||
- | < | ||
- | k <- c(2, 3, 2, 4, 5, 5, 2, 2, 4, 1) | ||
- | set.seed(1024) | ||
- | ks <- sample(k, 4) | ||
- | mean(ks) | ||
- | sd(ks) | ||
- | (sd(ks)*3)/ | ||
- | ######### | ||
- | mean(k) | ||
- | sd(k) | ||
- | |||
- | </ | ||
< | < | ||
- | > k <- c(2, 3, 2, 4, 5, 5, 2, 2, 4, 1) | + | ############ |
- | > k | + | set.seed(1010) |
- | [1] 2 3 2 4 5 5 2 2 4 1 | + | n.pop <- 100000 |
- | > | + | k <- sample(1:20, n.pop, replace = T) |
- | > set.seed(1024) | + | k.mean <- mean(k) |
- | > ks <- sample(k, | + | k.pvar <- var(k)*((n.pop-1)/n.pop) ## population var(k) |
- | > mean(ks) | + | k.mean |
- | [1] 2.25 | + | k.pvar |
- | > sd(ks) | + | ############ |
- | [1] 1.258306 | + | set.seed(10) |
- | > (sd(ks)*3)/4 | + | ks <- sample(k, |
- | [1] 0.9437293 | + | ks |
- | > | + | ks.mean <- mean(ks) |
- | > sd(k) | + | ks.var <- var(ks) |
- | [1] 1.414214 | + | ks.pvar <- var(ks)*(24/25) |
- | > | + | ks.mean |
- | > mean(k) | + | ks.var |
- | [1] 3 | + | ks.pvar |
+ | k.mean | ||
+ | k.pvar | ||
+ | ############ | ||
</ | </ | ||
degrees_of_freedom.txt · Last modified: 2021/03/03 11:24 by hkimscil