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Polynomial Regression
data(ChickWeight) str(ChickWeight) head(ChickWeight) Diet1=ChickWeight[ChickWeight$Diet=="1", ] attach(Diet1) plot(Time, weight) Mod1=lm(weight~Time) summary(Mod1) Mod2=lm(weight~Time+I(Time^2)) summary(Mod2) Mod3=lm(weight~Time+I(Time^2)+I(Time^3)) summary(Mod3) anova(Mod1, Mod2, Mod3)
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