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Polynomial Regression with Interaction Terms
data(ChickWeight) str(ChickWeight) head(ChickWeight) library(ggplot2) attach(ChickWeight) ggplot(ChickWeight, aes(Time, weight, colour=Diet))+geom_point()+geom_smooth()+ggtitle("Polynomial") Mod=lm(weight~Time+I(Time^2)*Diet) summary(Mod) ggplot(ChickWeight, aes(x=Diet, y=weight, colour=Diet))+geom_boxplot()
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