title: Formatting Seaborn Factorplot y-labels to percentages
body: <p>I'm trying to change the y-ticks to percentages in the following graph. The y variable is currently a mean of 0s and 1s. Is there a way to adjust the formatting to percentages in a factorplot?       </p>
  
  <pre><code>plt.figure(figsize = (10, 7))
  sns.factorplot(x="groups", y="has_invoice", hue = 'kind', 
      x_estimator=np.mean, data=df[df['app'] != 'other, other, web'], 
      order = ['&lt; 2', '2-4', '4-6', '6-8', '8-10', '10-12', '12-14', '14- 
      16', '&gt;16'], size=7, aspect=1)
  plt.xlabel('#')
  plt.title('')
  plt.ylabel('Rate (#Has Invoices / #Total Count)', fontsize = 15)
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/Wd0Xl.png" rel="nofollow noreferrer">Can't upload an image yet but it should be attached here!</a></p>