title: Pandas timeseries comparison
body: <p>I want to get the average difference between the overlapping parts of two time series. However, both their ranges and their intervals are different. What is the best way to solve these two problems?</p>
  
  <p>Example data:</p>
  
  <pre><code>Series 1:
  2014-08-05 05:03:00    25.194      
  2014-08-05 05:08:00    25.196      
  2014-08-05 05:13:00    25.197      
  2014-08-05 05:18:00    25.199      
  2014-08-05 05:23:00    25.192      
  
  Series 2:
  2014-08-05 05:12:00    25.000000
  2014-08-05 05:13:00    25.000000
  2014-08-05 05:14:00    25.000000
  </code></pre>