Well, a custom panel function is what you need (or one that may already exist somewhere: try googling on "high low intervals in R graphs" or some such).
So if you haven;t already done so, try Paul Morrell's Chapter on lattice plots from his book for how panel functions work: http://www.stat.auckland.ac.nz/~paul/RGraphics/chapter4.pdf -- Bert On Tue, Mar 22, 2011 at 12:12 PM, Christopher W Ryan <cr...@binghamton.edu> wrote: > I have a dataframe that looks like this: > > > str(chr) > 'data.frame': 84 obs. of 7 variables: > $ county: Factor w/ 3 levels "Broome","Nassau",..: 3 3 3 3 3 3 3 3 3 3 ... > $ item : Factor w/ 28 levels "Access to healthy foods",..: 21 19 20 > 18 16 3 2 6 17 8 ... > $ value : num 8644 15 3.5 3.9 7.7 ... > $ low : num 7897 9 2.5 2.6 7 ... > $ high : num 9390 22 4.5 5.2 8.4 37 30 23 24 101 ... > $ target: num 5034 11 2.7 2.6 6.1 ... > $ nys : num 6099 16 3.5 3.3 8 ... > >> head(chr) > county item value low high target nys > 1 Sullivan Premature death 8644.0 7897.0 9390.0 5034.0 6099.0 > 2 Sullivan Poor or fair health 15.0 9.0 22.0 11.0 16.0 > 3 Sullivan Poor physical health days 3.5 2.5 4.5 2.7 3.5 > 4 Sullivan Poor mental health days 3.9 2.6 5.2 2.6 3.3 > 5 Sullivan Low birthweight 7.7 7.0 8.4 6.1 8.0 > 6 Sullivan Adult smoking 29.0 22.0 37.0 15.0 20.0 > > I'd like to graph high and low for "Premature death" for each of the > three counties, with 3 vertical line segments, one connecting those > two points for each county. I can get the two points for each county: > >>xyplot(low+high ~ county, data=subset(chr, item=="Premature death")) > > but I have not yet been able to figure out how to draw the 3 vertical > line segments. Been struggling to understand panel functions, but no > success so far. I'd be grateful for any advice. > > Thanks. > > --Chris Ryan > SUNY Upstate Medical University > Clinical Campus at Binghamton > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Bert Gunter Genentech Nonclinical Biostatistics ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
