[R] Simple mean trajectory (ordinal variable)

[torvon]

I'm sorry, but I wasn't aware that I should attach data (and can't, because I
must not disclose them). 

Thanks for helping me get rid of the individual points, I'm now trying to
get standard errors and - more importantly - parallel lines for different
values of a variable, e.g. history of depression YES=line1 , NO=line2. 

Adding group=variable, in the xyplot argument doesn't have any effect. 

Sorry, I really did read through the xyplot document and the help, and
googled this problem, but found no solution.

-T




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