title: How to plot the variant circular bar chart in r with ggplot
body: <p>I want to plot a picture like this but I don't know how to plot it with R. I saw a tutorial on this <a href="https://www.data-to-viz.com/graph/circularbarplot.html" rel="noreferrer">website</a> but this is not what I needed. It is like a circular bar chart except that, in the picture below every bar is not a single value but a series value denote different incidence in a different year.</p>
  <p>In the picture below is the template.</p>
  <p>Any help will be highly appreciated!</p>
  <p>My fake data:</p>
  <pre><code>structure(list(year = c(2010, 2011, 2012, 2010, 2011, 2012, 2010, 
  2011, 2012, 2010, 2011, 2012), disease = c(1, 1, 1, 2, 2, 2, 
  3, 3, 3, 4, 4, 4), group = c(&quot;A&quot;, &quot;A&quot;, &quot;A&quot;, &quot;A&quot;, &quot;A&quot;, &quot;A&quot;, &quot;B&quot;, 
  &quot;B&quot;, &quot;B&quot;, &quot;B&quot;, &quot;B&quot;, &quot;B&quot;), incidence = c(0.2, 0.3, 0.4, 0.1, 0.3, 
  0.2, 0.5, 0.6, 0.7, 0.8, 0.9, 0.3)), row.names = c(NA, -12L), class = c(&quot;tbl_df&quot;, 
  &quot;tbl&quot;, &quot;data.frame&quot;))
  </code></pre>
  <p><a href="https://i.stack.imgur.com/w5TtL.png" rel="noreferrer"><img src="https://i.stack.imgur.com/w5TtL.png" alt="enter image description here" /></a></p>