stuck on making a line graph across time, with 4 categories
Christopher W. Ryan <cryan <at> binghamton.edu> writes:
I can't seem to find just what I'm looking for in R help, Everitt and Hothorn HSAUR, Murrell's book, or the R graphics gallery at http://addictedtor.free.fr/graphiques/. Probably not looking efficiently, but anyway, If my data look like this:
head(data)
cat startyear studentid 1 other 2001 12 2 UHS 2001 17 3 Lourdes 2001 10 4 Endwell 2001 3 5 other 2002 13 6 UHS 2002 19
What is the easiest way to make a line graph like this (made this one in Stata): http://bingweb.binghamton.edu/~cryan/Workload.png Thank you.
assuming "studentid" is your students, library(lattice) xyplot(studentid~startyear,groups=cat,auto.key=TRUE,type="l",data=data) (I think -- haven't tested at all) that, or reshape the data to wide format and use matplot. Ben Bolker