I have a dataframe comprising a vector of E. coli concentrations, a vector of 
months when the samples were taken, and a vector of sampled sites.  I�d like to 
produce a lattice with sites along the horizontal axis, and months on the 
vertical.  Each site-month box would then contain concentrations ranging along 
its x axis.



I think this would use dotchart (or possibly stripchart) in the lattice.  I�ve 
been reading the lattice and xyplot documents and I�m overwhelmed.  I�d 
appreciate help in how to write the call.



David


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