Hi Karin,
Try this
xyplot(numbers~sqrt(breaks)|moltype+disttype,
groups = type,
data = alldata,
panel = function(x, y, ...){
panel.abline(h = 0, col.line = 1)
panel.xyplot(x, y, ...,
pch = 1,
col.symbol = 1)})
Look at panel.abline in the lattice help for more details. Here, "h = 0"
will plot a horizontal line at y = 0 in each of your panels. Similarly,
"v = 0" will plot a vertical line at x = 0 in each of your panels. You
will need to build a vector to plots these lines at different coordinates.
Sebastien
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