Re: [R] stuck on making a line graph across time, with 4 categories

From: Ben Bolker <bolker_at_ufl.edu>
Date: Thu, 26 Jun 2008 19:22:41 +0000 (UTC)

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



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