title: Extracting parameter coefficients from the summary function
body: <p>I have fitted a linear regression model:</p>
  
  <pre><code>   Lin &lt;- lm(y~x, data=df)
  </code></pre>
  
  <p>When I use the <code>summary</code> function, I get some output. How do I extract the parameter coefficients from this output?</p>