[R] Odp: fitting a quadratic function - poly?

[Bert Gunter]

Below.

-- Bert 


Bert Gunter
Genentech Nonclinical Statistics


Coefficients are different as you fit different values. See

?poly

poly(-10:10,2)

I believe that others give you better explanation. So you can not use 
coefficients evaluated by lm(.~poly(...)) directly.

-- Well, it depends what you mean by "use...directly." But I think the
answer is, "yes you can." See ?SafePrediction  for details. -- Bert

Regards
Petr

> 
> Thanks in advance,
> Stefan
> 
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