Oh, I guess I just wasn't thinking of them as population pyramids since the 
variables A-M are actually responses to unrelated survey questions and not age 
bins.  But that's silo'd thinking because why would that matter?

Thanks for the brain nudge.  I'll check out the plotrix link.

Jen

-----Original Message-----
From: David Winsemius <dwinsem...@comcast.net> 
Sent: Tuesday, September 17, 2019 6:32 PM
To: Sabatier, Jennifer F. (CDC/DDPHSIS/CGH/DGHP) <f...@cdc.gov>; 
r-help@r-project.org
Subject: Re: [R] bi-directional bar chart with a central axis


On 9/17/19 3:14 PM, Sabatier, Jennifer F. (CDC/DDPHSIS/CGH/DGHP) via R-help 
wrote:
> Hi R-help,
>
> I have this data:
>
> my.dta <-data.frame(matrix(c(
> 26.3, 21.4,
> 20.1, 13.4,
> 7.9,  3.9,
> 16.5, 14.6,
> 5.3,  3.6,
> 38.6, 25.6,
> 34.4, 21.6,
> 77.4, 79.5,
> 58.2, 56.1,
> 80.5, 84,
> 37.7, 31.9,
> 19.9, 28.1,
> 6.2,  5.9     
> ), nrow=13, ncol=2, byrow=T,
> dimnames=list(c('A',  'B',    'C',    'D',    'E',    'F',    'G',   'H',     
> 'I',    'J',    'K',    'L',    'M'),
> c("Males", "Females"))
> ))
>
> I want to make a graph that looks like this:
>
> https://i1.wp.com/stephanieevergreen.com/wp-content/uploads/2012/11/ba
> cktoback11.jpg?resize=864%2C379&ssl=1


I suppose it helps to know that these are called "pyramid charts" 
because of their common use in demographic circles for displaying comparative 
population structures of men and women ("population pyramids").


https://markmail.org/search/?q=list%3Aorg.r-project.r-help+pyramid+chart


Also look in the plotrix package since I seem to remember that it has 
one nicely documented and illustrated.

-- 

David.

>
> Any help would be highly appreciated!
>
> Best,
>
> Jen
>
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