title: scipy p-value returns 0.0
body: <p>Using a 2 sample Kolmogorov Smirnov test, I am getting a p-value of 0.0.  </p>
  
  <pre><code>&gt;&gt;&gt;scipy.stats.ks_2samp(dataset1, dataset2)
  (0.65296076312083573, 0.0)
  </code></pre>
  
  <p>Looking at the histograms of the 2 datasets, I am quite confident they represent two different datasets.  But, really, p = 0.0?  That doesn't seem to make sense.  Shouldn't it be a very small but positive number?</p>
  
  <p>I know the return value is of type numpy.float64.  Does that have something to do with it?</p>
  
  <p>EDIT:
  data here: <a href="https://www.dropbox.com/s/jpixhz0pcybyh1t/data4stack.csv" rel="noreferrer">https://www.dropbox.com/s/jpixhz0pcybyh1t/data4stack.csv</a></p>
  
  <pre><code>scipy.version.full_version
  '0.13.2'
  </code></pre>