Re: [R] remove higher order interaction terms

2013-04-17 Thread Liviu Andronic
On Wed, Apr 17, 2013 at 2:33 PM, Marc Schwartz wrote: > If you only want up to say second order interactions: > >> summary(lm(mpg ~ (cyl + disp + hp + drat) ^ 2, data = mtcars)) > This is what I was looking for. Thank you so much. > This is covered in ?formula > Indeed. I tried to parse ?formula

Re: [R] remove higher order interaction terms

2013-04-17 Thread Marc Schwartz
On Apr 17, 2013, at 7:23 AM, Liviu Andronic wrote: > Dear all, > Consider the model below: > >> x <- lm(mpg ~ cyl * disp * hp * drat, mtcars) >> summary(x) > > Call: > lm(formula = mpg ~ cyl * disp * hp * drat, data = mtcars) > > Residuals: >Min 1Q Median 3Q Max > -3.5725 -

[R] remove higher order interaction terms

2013-04-17 Thread Liviu Andronic
Dear all, Consider the model below: > x <- lm(mpg ~ cyl * disp * hp * drat, mtcars) > summary(x) Call: lm(formula = mpg ~ cyl * disp * hp * drat, data = mtcars) Residuals: Min 1Q Median 3Q Max -3.5725 -0.6603 0.0108 1.1017 2.6956 Coefficients: Estimate S