(Red-faced and sheepish)....
Sorry to waste your time, the answer is obvious:
barplot(table(hcd.df$datecat, hcd.df$auth.valence), beside=TRUE)
----------------------------------------------------------------------
Andrew J Perrin - andrew_perrin at unc.edu - http://www.unc.edu/~aperrin
Assistant Professor of Sociology, U of North Carolina, Chapel Hill
269 Hamilton Hall, CB#3210, Chapel Hill, NC 27599-3210 USA
On Thu, 14 Feb 2002, Andrew Perrin wrote:
> Greetings-
>
> I'm venturing into a new (for me) area of using R: some presentation
> graphics based on R data.
>
> I'd like to compare two distributions of ordinal variables in
relatively
> small (N=203 and 207) subsets of an R dataset. I can get a reasonably
> good picture of the distributions' differences with:
>
> x11()
> plot(table(hcd.df$auth.sum[hcd.df$datecat==1]),
type='l',xlim=c(-8,7),
> ylim=c(0,59))
> par(new=TRUE)
> plot(table(hcd.df$auth.sum[hcd.df$datecat==2]), type='l',
> col='red',xlim=c(-8,7), ylim=c(0,59))
>
> but the line style is awkward and possibly even misleading when the values
> are ordinal. What I'd like to use is a barplot, such that the
> distributions are interspersed by value; that is, the furthest left bar
> represents auth.sum==-8 where datecat==1, then immediately next to it is
> auth.sum==-8 where datecat==2, then a small amount of space, then the -7
> bars, etc. (I may not be doing the best job describing this, but it's
a
> commonly-seen graph type; see
> http://www.parentingbookmark.com/media/bar%20graph.jpg for an example
> [thanks to images.google.com for finding it]).
>
> The closest I've come is to use:
> barplot(table(hcd.df$auth.valence, hcd.df$datecat), beside=TRUE)
>
> which plots the two *distributions* side by side (all the datecat==1 then
> all the datecat==2).
>
> Any advice?
>
> Thanks.
>
> ----------------------------------------------------------------------
> Andrew J Perrin - andrew_perrin at unc.edu - http://www.unc.edu/~aperrin
> Assistant Professor of Sociology, U of North Carolina, Chapel Hill
> 269 Hamilton Hall, CB#3210, Chapel Hill, NC 27599-3210 USA
>
>
>
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