[R] Interaction plots as lines or bars?

Dieter Menne dieter.menne at menne-biomed.de
Thu May 28 08:25:58 CEST 2009

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


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