title: Print 'std err' value from statsmodels OLS results
body: <p>(Sorry to ask but <a href="http://statsmodels.sourceforge.net/" rel="noreferrer">http://statsmodels.sourceforge.net/</a> is currently down and I can't access the docs)</p>
  
  <p>I'm doing a linear regression using <code>statsmodels</code>, basically:</p>
  
  <pre><code>import statsmodels.api as sm
  model = sm.OLS(y,x)
  results = model.fit()
  </code></pre>
  
  <p>I know that I can print out the full set of results with:</p>
  
  <pre><code>print results.summary()
  </code></pre>
  
  <p>which outputs something like:</p>
  
  <pre><code>                            OLS Regression Results                            
  ==============================================================================
  Dep. Variable:                      y   R-squared:                       0.952
  Model:                            OLS   Adj. R-squared:                  0.951
  Method:                 Least Squares   F-statistic:                     972.9
  Date:                Mon, 20 Jul 2015   Prob (F-statistic):           5.55e-34
  Time:                        15:35:22   Log-Likelihood:                -78.843
  No. Observations:                  50   AIC:                             159.7
  Df Residuals:                      49   BIC:                             161.6
  Df Model:                           1                                         
  Covariance Type:            nonrobust                                         
  ==============================================================================
                   coef    std err          t      P&gt;|t|      [95.0% Conf. Int.]
  ------------------------------------------------------------------------------
  x1             1.0250      0.033     31.191      0.000         0.959     1.091
  ==============================================================================
  Omnibus:                       16.396   Durbin-Watson:                   2.166
  Prob(Omnibus):                  0.000   Jarque-Bera (JB):                3.480
  Skew:                          -0.082   Prob(JB):                        0.175
  Kurtosis:                       1.718   Cond. No.                         1.00
  ==============================================================================
  
  Warnings:
  [1] Standard Errors assume that the covariance matrix of the errors is correctly specified.
  </code></pre>
  
  <p>I need a way to print out <em>only</em>  the values of <code>coef</code> and <code>std err</code>.</p>
  
  <p>I can access <code>coef</code> with:</p>
  
  <pre><code>print results.params
  </code></pre>
  
  <p>but I've found no way to print out <code>std err</code>.</p>
  
  <p>How can I do this?</p>