title: Using a Boolean statement in matplotlib -- graph only TRUE values
body: <p>I'm trying to create a graph based on data from a csv file. I need to show on the graph only the # of instances a certain name, let's call it <code>JOE</code> appear in the dataset across a set of years which are listed in the csv file under the column title <code>DATA_YEAR</code></p>
  
  <pre><code>HC = pd.read_csv(filename)
  pd.crosstab(HC['DATA_YEAR'], HC['COLUMN2_TITLE'] == 'JOE').plot(kind='bar')
  </code></pre>
  
  <p>It works except the graph shows "True" and "False" results, whereas I only want the "True" ones to show. Can someone help? I'm very new to coding!!</p>