title: Statsmodels : AttributeError: 'module' object has no attribute 'x13'
body: <p>I am implementing a seasonal ARIMA prediction for time series in Python. I am using Statsmodels 0.7.0. </p>
  
  <p>What I have done so far is: </p>
  
  <pre><code>import statsmodels.api  as sm
  res= sm.tsa.x13.x13_arima_select_order(time_series)
  </code></pre>
  
  <p>But I am getting this error : </p>
  
  <blockquote>
    <p>AttributeError: 'module' object has no attribute 'x13'</p>
  </blockquote>
  
  <p>I have no idea how to fix it. </p>