Shaun,
See the help on contrasts ...
?contr.treatment
Jean
On Tue, Jun 25, 2013 at 7:07 PM, Shaun Jackman <sjack...@gmail.com> wrote:
> 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
>
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