On Jan 9, 2011, at 8:13 PM, Jim Burke wrote:
Hello everyone,
I have a simple histogram of gasoline prices going back a few years
that I want to insert a line graph of consumer price index (cpi)
over the histogram. I have looked through the "Lattice" book by
Deepayan Sarkar but don't see anything there. How might this be
done? An example would be wonderful.
Current code snippet follows. For example additional field to add as
a line graph would be a cpi calculation like "gas_data$regular *
(2010_cpi / gas_data$year )".
xyplot( regular ~ as.Date(gas_data$dates,"%b %d, %Y") , data =
gas_data,
type = c("g", "h" ))
http://finzi.psych.upenn.edu/R/library/latticeExtra/html/doubleYScale.html
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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