using_dummy_variables
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using_dummy_variables [2016/05/09 08:29] – hkimscil | using_dummy_variables [2019/10/18 10:18] (current) – hkimscil | ||
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===== 2 groups ===== | ===== 2 groups ===== | ||
data: | data: | ||
- | {{: | + | {{: |
- | {{elemapi2_categories.sps}} | + | {{:elemapi2_categories.sps}} |
+ | |||
+ | {{: | ||
+ | in r < | ||
< | < | ||
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meals 6 pct free meals | meals 6 pct free meals | ||
ell 7 english language learners | ell 7 english language learners | ||
- | yr_rnd 8 year round school 무방학학교 | + | yr_rnd 8 year round school 무방학학교 |
mobility 9 pct 1st year in school | mobility 9 pct 1st year in school | ||
acs_k3 10 avg class size k-3 | acs_k3 10 avg class size k-3 | ||
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만약에 ANOVA 테스트에서와 같이 종류가 3개 이상인 변인은 어떻게 처리해야 할까? 아래는 이를 regression으로 테스트 한 결과이다. | 만약에 ANOVA 테스트에서와 같이 종류가 3개 이상인 변인은 어떻게 처리해야 할까? 아래는 이를 regression으로 테스트 한 결과이다. | ||
- | < | + | < |
- | Model R R Square Adjusted R Square Std. Error of the Estimate | + | > mod2 <- lm(api00 ~ factor(mealcat), data=datavar) |
- | 1 .867a .752 .752 70.908 | + | > mod2 |
- | a. Predictors: | + | |
- | ANOVA(b) | + | Call: |
- | Model Sum of Squares df Mean Square F Sig. | + | lm(formula = api00 ~ factor(mealcat), data = datavar) |
- | 1 Regression 6072527.519 1 6072527.519 1207.742 .000a | + | |
- | Residual 2001144.479 398 5028.001 | + | |
- | Total 8073671.997 399 | + | |
- | a. Predictors: | + | |
- | b. Dependent Variable: api 2000 | + | |
- | Coefficients(a) | + | Coefficients: |
- | Unstandardized Coefficients Standardized | + | (Intercept) |
- | Model B Std. Error Beta t Sig. | + | |
- | 1 (Constant) 950.987 9.422 100.935 .000 | + | |
- | Percentage of -150.553 4.332 -.867 -34.753 .000 | + | > summary(mod2) |
- | free meals in | + | |
- | 3 categories | + | Call: |
- | a. Dependent Variable: api 2000 | + | lm(formula = api00 ~ factor(mealcat), |
+ | |||
+ | Residuals: | ||
+ | | ||
+ | -253.394 | ||
+ | |||
+ | Coefficients: | ||
+ | Estimate | ||
+ | (Intercept) 805.718 6.169 130.60 < | ||
+ | factor(mealcat)2 | ||
+ | factor(mealcat)3 -301.338 | ||
+ | --- | ||
+ | Signif. codes: | ||
+ | |||
+ | Residual standard error: 70.61 on 397 degrees of freedom | ||
+ | Multiple R-squared: | ||
+ | F-statistic: | ||
+ | |||
+ | > | ||
</ | </ | ||
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- | ^ Excluded Variables(b) | + | ^ **Excluded Variables(b)** ^^^^^^^ |
| | | | | | | Collinearity Statistics | | | | | | | | Collinearity Statistics | ||
| Model | | Model | ||
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해석에 대해서 . . . . | 해석에 대해서 . . . . | ||
- | ^ '' | + | ^ **interpretation** |
- | | | mealcat=1 | + | | | mealcat=1 |
|yr_rnd=0 | |yr_rnd=0 | ||
|yr_rnd=1 | |yr_rnd=1 | ||
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^ **interpretation** | ^ **interpretation** | ||
- | | | mealcat=1 | + | | | mealcat=1 |
+ | | | mealcat=1-> | ||
| yr_rnd=0 | | yr_rnd=0 | ||
| ::: | intercept + \\ BMealCat1 | | ::: | intercept + \\ BMealCat1 |
using_dummy_variables.1462751991.txt.gz · Last modified: 2016/05/09 08:29 by hkimscil