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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