[R] Plotting 1 covariate, 3 factors

[Paul Chatfield]

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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