title: How to represent boolean data in graph
body: <p>How can I represent below data in comprehensive graph? Tried to with group by() from Pandas but the result in not comprehensive.
  My objectif is to show what causes the most accidents between below combinations </p>
  
  <pre><code>pieton  bicyclette  camion_lourd  vehicule
  0       0           1             1 
  0       1           0             1
  1       1           0             0
  0       1           1             0
  0       1           0             1
  1       0           0             1
  0       0           0             1
  0       0           0             1
  1       1           0             0
  0       1           0             1
  
  y = df.groupby(['pieton', 'bicyclette', 'camion_lourd', 'vehicule']).size()
  y.unstack()
  </code></pre>
  
  <p>result:</p>
  
  <p><a href="https://i.stack.imgur.com/0s69U.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0s69U.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/12plC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/12plC.png" alt="enter image description here"></a></p>