Hi, I've used `lm` to create a linear model of a continuous variable against a factor variable with four levels using an example R data set (see below). By default, it uses a treatment contrast matrix that compares each level of the factor variable with the first reference level (three comparisons in total). I'd like to compare each level with the global mean (four comparisons in total), and produce a table similar to `summary.lm`. How do I go about this?
```r model <- lm(weight ~ Diet, ChickWeight) summary(model) ``` Thanks, Shaun ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
