Easy to write - here's a quick piece of code (without bells and whistles 
though...)



dat1 <- rnorm(1000)
dat2 <- rgamma(3000, shape=3)

biHist <- function(d1, d2) {
        col1 <- "#FFCCBB"
        col2 <- "#BBCCFF"
        hAll <- hist(c(d1, d2))
        hD1 <- hist(d1, breaks=hAll$breaks)
        hD2 <- hist(d2, breaks=hAll$breaks)
        plot(NULL,
             xlim = c(-1.05 * max(hD1$counts), 1.05 * max(hD2$counts)),
             ylim = c(min(hAll$breaks), max(hAll$breaks)),
             xlab = "frequencies",
             ylab = "values",
             xaxt = "n")
        axis(side = 1,
             lwd = 0,
             lwd.ticks = 1,
             at = axTicks(1),
             labels = abs(axTicks(1)))
        abline(v = 0)
        rect(-hD1$counts,
             hAll$breaks[-length(hAll$breaks)],
             0,
             hAll$breaks[-1],
             col=col1)
        rect(0,
             hAll$breaks[-length(hAll$breaks)],
             hD2$counts,
             hAll$breaks[-1],
             col=col2)
}

biHist(dat1, dat2)



Let me know in case this needs modifications that you can't easily make yourself
:-)


B.






On Jun 2, 2015, at 4:43 PM, David Winsemius <dwinsem...@comcast.net> wrote:

> 
> On Jun 2, 2015, at 11:13 AM, Dan Abner wrote:
> 
>> Hi all,
>> 
>> Does anyone know how to create a graph of propensity scores like the
>> one on the left in the attachment? I can easily generate the one on
>> the right: How does one force the respective histograms to share the
>> same rotated x-axis? Is it possible to set the horizontal white space
>> between these to graphs to 0 so that there is only the single line
>> running down the middle of the graph?
>> 
> 
> I think you will find that "pyramid" plots of this sort are in some packages 
> and that similar requests (to get rid of the middle space) have been made in 
> the past. Pyramid plots are often used by demographers to compare and display 
> age distributions of both genders. Why not see if that work can be found with 
> a search engine. I use this MarkMail link on my browser to search the Archive
> 
> http://markmail.org/search/?q=list%3Aorg.r-project.r-help
> 
> ....(but you could also direct the Google Advanced Search function to the 
> real Archives if you wanted:
> 
> https://stat.ethz.ch/pipermail/r-help/
> 
> 
>> Thanks,
>> 
>> Dan
>> <graphs.pdf>______________________________________________
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> 
> David Winsemius
> Alameda, CA, USA
> 
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

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