To make such a plot, I would have thought your want your data structure to
be:
yourdat:
Column A: Date
Column B; Chemical
Column C: Result
....
After subsetting this to the chemicals you want or doing the subsetting in
your plot command, something like (base R)
boxplot(Result ~ Chemical, subset=yourdat$Chemical %in% c("Ca","Cl",
"Cond","Mg","Na","SO2","TDS"))
You probably can get what you want one way or the other with your current
data structure -- though you may have to use ggplot or trellis -- but it
does appear to be inconvenient.
Whether I'm correct or not in my understanding of your situation, an
important message is: you should choose your data structure to facilitate
the analysis that you have in mind. IMHO, this is one of R's great
strengths: it provides rich facilities for manipulating data tightly
integrated with plotting and analytical capabilities.
Cheers,
Bert
On Wed, Nov 2, 2011 at 9:46 AM, Rich Shepard <rshep...@appl-ecosys.com>wrote:
> On Wed, 2 Nov 2011, Rich Shepard wrote:
>
> I want a subset of this with only 7 chemicals: Ca, Cl, Cond, Mg, Na, SO4,
>> and TDS.
>>
>
> I should have also written that what I ultimately want is to create a
> box-and-whisker plot for these 7 chemicals in a single panel. If that can
> be
> done directly from the source data frame without creating another subset, I
> want to learn the syntax for that.
>
> Rich
>
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>
--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
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