title: Compare smoothed signal to the input signal
body: <p>I smooth a series of data points using the algorithm described here: <a href="http://www.scipy.org/Cookbook/SignalSmooth" rel="nofollow">http://www.scipy.org/Cookbook/SignalSmooth</a> .</p>
  
  <p>How could I compare the smoothed signal with the input signal afterward? I'm hoping I could get a scalar describing how "close" the output is from the input. Is there any standard way to do this? Some term I could look for?</p>
  
  <p>I have no idea what to even look for. Thanks!</p>