Re: [R] Effect size of comparison of two levels of a factor in multiple linear regression

2008-02-06 Thread Christoph Mathys
On Feb 4, 08:49 AM, Chuck Cleland wrote: On 2/3/2008 10:09 AM, Christoph Mathys wrote: Dear R users, I have a linear model of the kind outcome ~ treatment + covariate where 'treatment' is a factor with three levels (0, 1, and 2), and the covariate is continuous. Treatments 1 and 2 both have

Re: [R] Effect size of comparison of two levels of a factor in multiple linear regression

2008-02-04 Thread Chuck Cleland
On 2/3/2008 10:09 AM, Christoph Mathys wrote: Dear R users, I have a linear model of the kind outcome ~ treatment + covariate where 'treatment' is a factor with three levels (0, 1, and 2), and the covariate is continuous. Treatments 1 and 2 both have regression coefficients

[R] Effect size of comparison of two levels of a factor in multiple linear regression

2008-02-03 Thread Christoph Mathys
Dear R users, I have a linear model of the kind outcome ~ treatment + covariate where 'treatment' is a factor with three levels (0, 1, and 2), and the covariate is continuous. Treatments 1 and 2 both have regression coefficients significantly different from 0 when using treatment contrasts with