title: Calculate correlations based on tf-idf values?
body: <p>Does it make sense to calculate pearson correlation coefficients based on a tf-idf matrix to see which terms occur in combination with other terms? Is it mathematically correct?</p>
  
  <p>My output is a correlation matrix with correlation coefficients in each cell for each term.</p>
  
  <ul>
  <li>-------term1 term2 term3</li>
  <li>term2 </li>
  <li>term2 </li>
  <li>term2</li>
  </ul>