On Jan 24, 2011, at 6:49 PM, Mike Miller wrote:
I make plenty of scatterplots, especially using scatterplot.matrix
from library(car). One thing I don't know how to do is determine
which points are plotted last. Sometimes I plot a large number of
points for multiple groups represented by different colors.
?points
I would like to guarantee that point that are far from the centroid
for their group are plotted last. This way they will be visible
because they won't be buried under a pile of points from another
group.
As it stands, it looks like scatterplot.matrix (and maybe other
plotting functions) lay down a group at a time, in order, so that
the first group is most likely to be buried under later groups. I
try to sort factor levels so that the biggest groups go first, and
that helps a little, but it isn't the complete solution I'm looking
for.
Thanks in advance.
Mike
--
Michael B. Miller, Ph.D.
Minnesota Center for Twin and Family Research
Department of Psychology
University of Minnesota
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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