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

[ONKELINX, Thierry]

A solution with ggplot2 would be

dataset <- data.frame(cat = factor(rbinom(1000, 1, prob = .33), labels =
LETTERS[1:2]), startyear = floor(runif(1000, 2001, 2009)), studentid =
1:1000)

library(ggplot2)
ggplot(dataset, aes(x = startyear, colour = cat)) + stat_bin(aes(y =
..count..), geom="line", breaks = 2000:2008 + 0.5)

HTH,

Thierry 


------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces op r-project.org [mailto:r-help-bounces op r-project.org]
Namens Christopher W. Ryan
Verzonden: donderdag 26 juni 2008 21:18
Aan: r-help op stat.math.ethz.ch
Onderwerp: [R] stuck on making a line graph across time, with 4
categories

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.

--Chris
-- 
Christopher W. Ryan, MD
SUNY Upstate Medical University Clinical Campus at Binghamton
40 Arch Street, Johnson City, NY  13790
cryanatbinghamtondotedu
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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