How can I modify the example below to put a dot at the mean of each violin
plot? I assume I use panel.points but that's as far as I can go.
bwplot(voice.part ~ height, singer,
panel = function(..., box.ratio) {
panel.violin(..., col = "transparent",
varwidth = FALSE, box.ratio = box.ratio)
#panel.points(mean(x.....))
} )
TIA, Andy
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