title: Generalized Method of Moments Estimation in Python
body: <p>I'm am trying to perform Instrumental Variable (IV) regression in Python. I saw online that the statsmodels.gmm package has the function I need (<a href="http://statsmodels.sourceforge.net/devel/gmm.html#" rel="nofollow">http://statsmodels.sourceforge.net/devel/gmm.html#</a>), but when I ran <code>import statsmodels.gmm as gmm</code> in Python I get this error <code>No module named gmm
  </code>. I'm using ipython with python 2.7.9. Any suggestions would be much appreciated.</p>