Re: [R] Plotting a cubic line from a multiple regression

[EMAIL PROTECTED] wrote in news:[EMAIL PROTECTED] uk: >> I'm attempting to plot a cubic relationship between two variables >> controlling for the effects of a third variable. In this short >> example, I'm trying to use AGE to predict CORTEX while controlling >> for the effects of TIV (total int

Re: [R] Plotting a cubic line from a multiple regression

Hi Ashish, I am rather more concerned about whether what you outlined is legitimate (your question 1 below). If you are looking at children, higher AGE will be associated with higher TIV, so both variables would essentially measure the same thing (see Miller & Chapman, Misunderstanding Analysi

Re: [R] Plotting a cubic line from a multiple regression

> I'm attempting to plot a cubic relationship between two variables > controlling for the effects of a third variable. In this short > example, I'm trying to use AGE to predict CORTEX while controlling for > the effects of TIV (total intracranial volume): > > > cortex =