[R] Plotting 1 covariate, 3 factors

Paul Chatfield p.s.chatfield at rdg.ac.uk
Thu Oct 8 11:26:52 CEST 2009

That's solved it.  Superb!

> All you probably need is to make f2 a factor (e.g., y ~ factor(f2) |
> f1). Otherwise dotplot() doesn't know which one to treat as
> categorical.
> -Deepayan

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