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

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 coeffi

[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 contr