Can someone point me to a justification for the design decisions, which seem to be similar in lattice and ggplot2, of (1) gray backgrounds and (2) filled points? [I seem to remember seeing somewhere the opposite recommendation for points, i.e. that open points make it much easier to see if there are overlapping values -- and this would be a reason that pch=1 gives an open circle ...]
cheers
Ben Bolker
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