title: short formula call for many variables when building a model
body: <p>I am trying to build a regression model with <code>lm(...)</code>. My dataset has lots of features( &gt;50). I do not want to write my code as:</p>
  <pre><code>lm(output ~ feature1 + feature2 + feature3 + ... + feature70)
  </code></pre>
  <p>I was wondering what is the short hand notation to write this code?</p>