title: distribution plot in python
body: <p><img src="https://i.stack.imgur.com/B0NS3.png" alt="enter image description here"></p>
  
  <p>I need your help in understanding the distribution plot. I was going through tutorial on <a href="http://devarea.com/python-machine-learning-example-linear-regression/#.WxQmilMvxsN" rel="nofollow noreferrer">this link</a>. At the end of the post they have mentioned:</p>
  
  <blockquote>
    <p>We can see from the graph that most of the times the predictions were correct (difference = 0).</p>
  </blockquote>
  
  <p>So I am not able to understand how are they analyzing the graph. </p>