title: Filtering in Pandas dataframe
body: <p>I'm grouping rotten tomatoes scores by director with the following:</p>
  
  <pre><code>director_counts = bigbadpanda.groupby(["Director"]).size().order(ascending = False)
  
  print director_counts ---&gt; 
  
  Director
  Woody Allen             44
  Alfred Hitchcock        38
  Clint Eastwood          32
  Martin Scorsese         29
  Steven Spielberg        29
  Sidney Lumet            25
  ...
  </code></pre>
  
  <p><strong>Question:</strong>
  What's the best way for me to filter by directors with more than 2 movies?</p>
  
  <p>For filtering by the average movies per director would this work? <code>bigbadpanda.groupby(["Director"]).size().mean()</code>)</p>