title: How to select all rows which contain values greater than a threshold?
body: <p>The request is simple: I want to select all rows which contain a value greater than a threshold.</p>
  
  <p>If I do it like this:</p>
  
  <pre><code>df[(df &gt; threshold)]
  </code></pre>
  
  <p>I get these rows, but values below that threshold are simply <code>NaN</code>. How do I avoid selecting these rows?</p>