> I am having some difficulties with effects plots from the effects package.
Your problem is probably not xlim, which the effects plots should accept; it's
more likely that you're trying to use base graphics to add symbols to a lattice
plot - effects uses lattice, not base graphics. The coordinate systems don't
mix.
Try googling 'adding points to lattice plots' or similar - but be prepared for
some intricate answers.
Steve E
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