title: T.Test across several columns at once?
body: <p>I'm attempting to do a T-Test across many different columns at once, but can't figure out how to do it. Here is what I have for one of the columns, <code>Clout</code>.</p>
  
  <pre><code>t.test(wf[wf$ThreadID == 249001,]$Clout,wf[wf$ThreadID == 230005,]$Clout)
  </code></pre>
  
  <p>But I have about 20 other columns, e.g. <code>Authentic</code>, <code>Tone</code></p>
  
  <p>How can I run this test across all columns?</p>