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.
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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