[R] xyplot type 'a' with mean symbols

[Jasmine]

Hi there

I almost have the graph I want (except for moving the legend into the
graph).

Can someone please tell me how to put symbols at the means for this graph?

xyplot (anxiety ~ treatment, groups=therapist, data=study2, ylim=c(0,50),
auto.key=T, type='a')

Thank you so much :)



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