variability_and_spread
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revision | |||
variability_and_spread [2019/09/24 13:56] – hkimscil | variability_and_spread [2019/09/30 20:27] (current) – removed hkimscil | ||
---|---|---|---|
Line 1: | Line 1: | ||
- | ====== Variability and Spread ====== | ||
- | Who are you going to use for the upcoming game (basketball)? | ||
- | ^ A ^^^^^^^ | ||
- | | 7 | 8 | 9 | 10 | 11 | 12 | 13 | | ||
- | | 1 | 1 | 2 | 2 | 2 | 1 | 1 | | ||
- | |||
- | |||
- | ^ B ^^^^^ | ||
- | | 7 | 8 | 10 | 11 | 13 | | ||
- | | 1 | 2 | 4 | 2 | 1 | | ||
- | |||
- | |||
- | ^ C ^^^^^^^ | ||
- | | 3 | 6 | 7 | 10 | 11 | 13 | 30 | | ||
- | | 2 | 1 | 2 | 3 | 1 | 1 | 1 | | ||
- | |||
- | < | ||
- | a <- c(7, | ||
- | b <- c(7, | ||
- | c <- c(3, | ||
- | c <- c(3, | ||
- | |||
- | data <- list(a,b,c) | ||
- | data | ||
- | sapply(data, | ||
- | sapply(data, | ||
- | sapply(data, | ||
- | |||
- | </ | ||
- | |||
- | < | ||
- | > data | ||
- | [[1]] | ||
- | | ||
- | |||
- | [[2]] | ||
- | | ||
- | |||
- | [[3]] | ||
- | | ||
- | |||
- | > sapply(data, | ||
- | [1] 10.0 9.8 10.0 | ||
- | > sapply(data, | ||
- | [1] 1.825742 1.751190 7.362065 | ||
- | > sapply(data, | ||
- | [1] 3.333333 | ||
- | |||
- | </ | ||
- | |||
- | |||
- | [[:range]] | ||
- | |||
- | [[: | ||
- | [[: | ||
- | * $ \sum \text{deviation score}^2 = \sum \text{ds}^2 $ | ||
- | |||
- | * $ \sum \text{error}^2 $ | ||
- | * error = 평균값으로 개인값을 추측했을 때 발생하는 오차 | ||
- | * (평균으로 추측했을 때 생기는) 오차의 제곱의 합 | ||
- | * (오차의) 제곱의 합 | ||
- | * 제곱의 합 | ||
- | * Sum of Square (SS) | ||
- | |||
- | * $ \sum \text{ds}^2 = \text{SS} = \text{Sum of Square} $ (([[: | ||
- | |||
- | * $$ \text{variance} = \frac {SS}{n-1} = \frac {SS}{df}$$ | ||
- | * calculation of variance (an easy way) | ||
- | * $ \displaystyle \frac{\sum(X_{i})}{N} - \mu^2$ | ||
- | |||
- | [[:standard deviation]] | ||
- | [[:standard score]] |
variability_and_spread.1569300987.txt.gz · Last modified: 2019/09/24 13:56 by hkimscil