[R] Linear regression on several groups

JesperHybel jesperhybel at hotmail.com
Fri Aug 13 14:56:09 CEST 2010

Example is spot on - sr for not providing one myself.
The results you calculate are what I'm looking for.

Would like a function F where I could type:

F(weight ~ Time, data = ChickWeight, SOME ARGUMENT = Diet))

Resulting in

for (i in 1:4){

lm(weight ~ Time, data = ChickWeight, subset = Diet==i)


I'm simply trying to minimize amount of looping and typing etc.

BR Jesper

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