On Wed, 12 May 2010, Simon Kiss wrote:
I'm working with the following code below to generate a
how do I set the h,c, and l values such that the significant, positive
residuals appear different on a grayscale printer from significant grayscale
residuals. The challenge as I see it is that one can only distinguish the
positive and negative residuals with the hue/. Varying the chroma and the
luminance only affect the distinctions between large and small and
significant and non significant. But my positive and negative residuals are
both large (absolutely) and significant, meaning that they will have the same
chroma and luminosity, but different hues.
I guess the key here is to find two separate hue values that appear
substantially different *on a grayscale printer* at the same chroma and
luminance. I have read through Zeileis et al. (2007, 2008) but can't quite
find the answer there.
I have also tried the Friendly shading to vary the line type, but I can't
find line types that are different enough to communicate the difference
between positive and negative residuals clearly.
This is difficult. In grayscale printing you have just one dimension
available for color shading, namely the luminance/brightness. This is
already used for the size of the residuals and so you need something else
to code the sign. In our HCL palettes this is done by the hue but in such
a way that the choice of hue does not change the luminance (this is the
excellent feature of HCL color space). So, as Jim already pointed out, you
can just do something about the type of filling or the borders etc.
Another option would be to use a single grayscale with dark colors for
large positive residuals and bright colors for large negative residuals
(or vice versa). However, none of the approaches will be very intuitive
and the color version will be much more powerful.
If you are forced to use grayscale, you might consider putting an
assocation plot (via function assoc()) next to the mosaic plot.
Best,
Z
Your assistance is appreciated.
mosaic(~educ+trade_off_scaled, shade=TRUE, main="Support For Environmental
Protection At The Expense of Creating Jobs By Education",
gp=shading_hcl(CST17$observed, CST17$expected, ASR17, df=6, h=c(260,0),
c=c(100,0), l=c(90,0)), labeling_args=list(rot_labels=c(25,90,0,0),
offset_labels=c(1,0,0,2), offset_varnames=c(2,0,0,4),
set_varnames=c(trade_off_scaled="Protecting The Environment Is More
Important Than Creating Jobs", educ="Level of Education")))
*********************************
Simon J. Kiss, PhD
SSHRC and DAAD Post-Doctoral Fellow
John F. Kennedy Institute of North America Studies
Free University of Berlin
Lansstraße 7-9
14195 Berlin, Germany
Cell: +49 (0)1525-300-2812,
Web: http://www.jfki.fu-berlin.de/index.html
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and provide commented, minimal, self-contained, reproducible code.
