title: How to create a Bubble chart timeline in R on one horizontal line
body: <p>I would like to create a bubble chart in R where each bubble represents a mass shooting: casualties <code>Killed</code> and casualties <code>Injured</code>something like the following:</p>
  
  <p><a href="https://i.stack.imgur.com/nODtS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nODtS.png" alt="FTData timeline"></a> </p>
  
  <p>Basically, I want a <code>ggplot2</code> bubble chart with <code>geom_point</code> on <strong>one</strong> horizontal line. Without a y-axis, where the size of the points represent the values (<code>Killed</code> and <code>Injured</code>).</p>
  
  <p>For reproducibility, you can find my dataset of mass shootings in the US (2017) in <a href="https://docs.google.com/spreadsheets/d/11nq5AK3Y1uXQJ8wTm14w9MkZOwAxHHTyPyEvUxCeGVc/edit?usp=sharing" rel="nofollow noreferrer">a shared google spreadsheet</a>. (<em>Do note that the terrible mass shooting in Las Vegas is left out for gradual points size purposes, I will add the one later on</em>).</p>
  
  <p>I created the following plot, but as described I would like to have all the dots (killed and Injured) on one horizontal line.</p>
  
  <pre><code>  data_per_date %&gt;%
    filter(Incident.Date != "2017-10-01") %&gt;% # Las Vegas shooting is left out for size purposes.
    ggplot(aes(x = Incident.Date, y = Killed)) +
    geom_point(aes(size = Injured),
               shape = 21,
               colour = "#FF6F00") + # Should be the orange transparant circles 
    geom_point(aes(size = Killed),
               alpha = 0.7,
               colour = "#B71C1C") # The red bubbles
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/Vaibk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Vaibk.png" alt="enter image description here"></a></p>
  
  <ul>
  <li><strong>P.s.</strong> It's quite a lot to ask, I know, but I can't find any timelines like these created with R. You smart people maybe have some Ideas of how to tackle this problem.</li>
  <li><strong>P.S. 2</strong> I could align the points in a vector graphic tool like Skech or Illustrator but rather want to know how to do this in R.</li>
  </ul>