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The another way to do ancova for other learning materials
10 March 2022, 3:55 PM
data(litter, package="multcomp")
attach(litter)
fit <- aov(weight ~ gesttime*dose, data=litter)
summary(fit) ##this can judge whether there are interaction bewteen virables
fit2 <- aov(weight ~ gesttime + dose)
summary(fit2) ##this can test whether the two variables have significant effects on weight
2 results