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

From: Christopher W. Ryan <cryan_at_binghamton.edu>
Date: Thu, 26 Jun 2008 14:18:16 -0500

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):


Thank you.


Christopher W. Ryan, MD
SUNY Upstate Medical University Clinical Campus at Binghamton
40 Arch Street, Johnson City, NY  13790
PGP public keys available at http://home.stny.rr.com/ryancw/

"If you want to build a ship, don't drum up the men to gather wood,
divide the work and give orders. Instead, teach them to yearn for the
vast and endless sea."  [Antoine de St. Exupery]

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Received on Thu 26 Jun 2008 - 18:57:16 GMT

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