Interaction plots as lines or bars?
Michael Kubovy wrote:
An editor has suggested that I use bar plots to capture an interaction of two 2-level factors and an interaction of a 2 by 3 factorial experiment. (It would seem that there's a fear that someone might try to interpolate between, e.g., 'male' and 'female'.) In general it seems to me that an interaction plot with lines is easier to read, and not likely to mislead. Does anyone know if and where this has been discussed?
Editors are paid by the ink. I have never seen anything else than lines for such a plot. However, I once was successful in using somewhat wider lines that looked barish. Which made me believe that the "paid by the ink" is not too bad an analogy: editors fear graphics that look too empty, so give them their black. I am sure Hadley will argue that this is the reason why ggplot2 by default has a gray background. Dieter
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