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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