Did lm(y ~ x | T) work for you? Let's see a reproducible example.
Peter jrflanders wrote:
I know that simple line plots showing a point representing the mean + an error bar are difficult in R, but I am clearly missing something. I simply want to show how a the mean and 95% CI of a chemical concentration (y) vary over space (x) under four temperature regimes (T; a categorical factor). plotmeans, in the gplots library, should allow for such a figure, right? After all, it invokes lm() in the help file for the formula, so any formula that works in lm() (e.g., y~x | T) should work in plotmeans. Obviously this is not so - can anyone suggest an alternative command or help me understand how the syntac differs? Thanks...
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