In R formulas, why do I have to use the I() function on power terms, like y ~ I(x^3)
The tilde operator is actually a function that returns an unevaluated expression, a type of language object. The expression then gets interpreted by modeling functions in a manner that is different than the interpretation of operators operating on numeric objects. The issue here is how formulas and specifically the “+, “:”, and “^” operators in … Read more