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34641
2009 Aug 25
4
table, xyplot, names, & loops
Hi R community,
I'm just starting out in R and have a basic question about xyplot and
tables. Suppose I had a table of data with the following names: Height,
Age_group, City. I'd like to plot mean Height vs Age_group for each City.
When I try to do the following:
> library(lattice)
> xyplot(mean(Height) ~ Age_group | City)
of course I get just one data point, the mean Height for