Re: [R] Barplot w/ single stacked bar

From: Marc Schwartz <marc_schwartz_at_comcast.net>
Date: Thu, 24 Jan 2008 10:32:25 -0600

Muenchen, Robert A (Bob) wrote:
> Hi All,
>
> I can get the barplot function to do many types of plots, stacked or
> otherwise. However, I cannot get it to do a *single* stacked bar. I've
> searched several books & listserv archives to no avail. I suspect I'm
> missing the obvious from the help file!
>
> I can reach my goal in ggplot2, although the relative heights of the
> bar's pieces don't seem quite right (it does generate a warning):
>
> library(ggplot2)
> x<-factor(1)
> y<-factor( c("Male","Male","Female") )
> mydata <- data.frame(x,y)
> rm(x,y)
> mydata
>
> #These are close to my goal:
> qplot( x, y, fill=y, geom="bar", data=mydata)
>
> # or
> ggplot(mydata, aes(x=x, y=y, fill=y)) + geom_bar()
>
> # But this places the bars beside each other rather than stack them.
> barplot( table(mydata$y), beside=FALSE)
>
> Thanks!
> Bob

Bob,

Try this:

  barplot(as.matrix(table(mydata$y)), beside = FALSE)

Conceptually, for a stacked bar, each bar is a column in a matrix. The components in a stacked bar are the row values in the column.

Thus, you need to create a single column matrix from your table.

One might question the value of such a plot however, if the intent is to provide a visual representation of the difference in counts/proportions between two groups. A side-by-side barplot or a dotchart would seem to be better here.

HTH, Marc Schwartz



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