Hi,
There is a very handy feature of boxplot() that will handle this
easily. You can write formulae of the form:
scores ~ groups
For your sample data:
# read in data
dat <- read.table(textConnection("
id cat value
1 a 12
2 a 23
3 a 14
4 b 2
5 b 3
6 c 9
7 c 8
8 c 10
9 d 30
"), header = TRUE)
closeAllConnections()
# this should give you boxplots by cat, also note the data argument
# which tells it where to look for the variable names
boxplot(value ~ cat, data = dat)
HTH,
Josh
On Tue, Sep 28, 2010 at 9:24 AM, deadlyspider <wrcstone at gmail.com>
wrote:>
> Hi,
>
> I have a data set in the following format:
>
>
> id ?cat ?value
> 1 ? a ? ?12
> 2 ? a ? ?23
> 3 ? a ? ?14
> 4 ? b ? ?2
> 5 ? b ? ?3
> 6 ? c ? ?9
> 7 ? c ? ?8
> 8 ? c ? ?10
> 9 ? d ? ?30
>
>
> I would like to set up boxplots for each category. The actual category
names
> are long and many so I would like this to be split automatically. Is this
> possible? Can anybody point me in the right direction for this?
>
> Thanks.
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Splitting-data-in-to-multiple-boxplots-tp2717491p2717491.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
--
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/