variability_and_spread
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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 |
- $ \sum \text{deviation score}^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)
variability_and_spread.1569287602.txt.gz · Last modified: 2019/09/24 10:13 by hkimscil