[R] Interaction plots as lines or bars?

Michael Kubovy kubovy at virginia.edu
Thu May 28 06:16:59 CEST 2009

Dear r-helpers,

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  

Professor Michael Kubovy
University of Virginia
Department of Psychology
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