Re: [R] help with ols and contrast functions in Design library

2009-11-05 Thread Frank E Harrell Jr
Timothy Clough wrote: Dear All, I'm trying to use the ols function in the Design library (version 2.1.1) of R to estimate parameters of a linear model, and then use the contrast function in the same library to test various contrasts. As a simple example, suppose I have three factors: feat

[R] help with ols and contrast functions in Design library

2009-11-05 Thread Timothy Clough
Dear All, I'm trying to use the ols function in the Design library (version 2.1.1) of R to estimate parameters of a linear model, and then use the contrast function in the same library to test various contrasts. As a simple example, suppose I have three factors: feature (3 levels), group (