How to use division in lm

问题

I would like to use lm to predict y by a/b (the quotient of a by b) when I do lm(y~a/b) I get a and b interactions, how can I do ?

回答1:

lm(y~I(a/b))

This is covered in ?formula.

来源：https://stackoverflow.com/questions/21587784/how-to-use-division-in-lm