People do best at comparing horizontal distances
with a common reference. IMHO This is due to our eyes being
separated horizontally.
What was interesting to me was the position of the reference line.
There was a very interesting example in a recent AMSTAT NEWS
(September 2011, #411, pp. 28 - 30 that showed sets of horizontal
bar charts but there was a reference line part way across. This
made it two directional. Aligning the bar on the middle category
makes it easier to read.
The DV was a single Likert-type item.
The horizontal scale was percentage (according to the figure
title but not the label).
The middle category of a Likert scale was centered on the
reference line. The width of the bar segment showed the percentage
of a group that endorsed that value of the DV.
This visualization presents a great deal of
information compactly.
(I would find it easier to read if there were
a more vertical separation between the sets of values of the IV's.
YMMV. I also think the Axis label should be "Percentage")
Has anyone on the list used SPSS to produce a stacked bar chart
with a reference line not at the left margin?
Art Kendall
Social Research Consultants
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Art Kendall
Social Research Consultants
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