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36 lines
925 B
36 lines
925 B
install.packages("car")
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library(car)
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data(anorexia, package = "MASS")
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anorexia
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# levene 테스트로 등분산성 확인
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leveneTest(Postwt~Treat, data = anorexia)
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# > leveneTest(Postwt~Treat, data = anorexia)
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# Levene's Test for Homogeneity of Variance (center = median)
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# Df F value Pr(>F)
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# group 2 1.7671 0.1785
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# 69
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# Pr(>F) = 0.1785, 0.05보다 크므로 귀무가설 채택 (등분산성 만족)
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# 분산분석
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out1 = aov(Postwt~Treat, data = anorexia)
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out1
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summary(out1)
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# > summary(out1)
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# Df Sum Sq Mean Sq F value Pr(>F)
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# Treat 2 919 459.5 8.651 0.000444 ***
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# Residuals 69 3665 53.1
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# p-value 가 0.05보다 작으므로 귀무가설 기각 (각 집단 평균에 차이가 있음)
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# ANOVA 분석
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out2 = anova(lm(Postwt~Treat, data = anorexia))
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out2
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summary(out2)
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# 일원 분산분석
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out3 = oneway.test(Postwt~Treat, data = anorexia)
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out3
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summary(out3) |