title: drawing pyramid plot using R and ggplot2
body: <p>I need to draw a pyramid plot, like the one attached.</p>
  
  <p><img src="https://i.stack.imgur.com/4upMI.png" alt="alt text"></p>
  
  <p>I found an example using R (but not ggplot) from <a href="http://sas-and-r.blogspot.com/2010/08/example-83-pyramid-plots.html?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+SASandR+%28SAS+and+R%29" rel="noreferrer">here</a>, can anyone give me some hint on doing this using ggplot? Thanks!</p>