title: statsmodels missing .api, .regression, etc
body: <p>I am trying to call <code>statsmodels.api</code> and <code>statsmodels.regression</code> in python 3.5 in a jupyter notebook.  This is inside a virtual env.  Using OSX El Capitan.  I get the error</p>
  
  <pre><code>AttributeError: module 'statsmodels' has no attribute 'regression'
  </code></pre>
  
  <p>and similarly for calling <code>statsmodels.api</code>:</p>
  
  <pre><code>AttributeError: module 'statsmodels' has no attribute 'api'
  </code></pre>
  
  <p>Tried uninstalling and reinstalling via <code>pip</code> to no avail.  Checked the <code>statsmodels</code> folder in <code>site-packages</code>, and it seems complete.  This is for the latest version <code>statsmodels 0.8.0</code>.  I also tried it for a separate python 2.7 venv, and am running into the same issue.  Any clues as to what's going on?</p>