title: Confidence of association rules
body: <p>Trying to understand an assignment I did not do correctly.</p>
  
  <p>Assume all the (closed) frequent itemsets and their support counts are:</p>
  
  <ul>
  <li>Support( {A, B, C, D} ) = 0.3</li>
  <li>Support( {A, B, C} ) = 0.4</li>
  <li>What is Conf(B -> ACD) = ? </li>
  <li>What is Conf(A -> BCD) = ?</li>
  <li>What is Conf(ABD -> C) = ?</li>
  <li>What is Conf(BD -> AC) = ?</li>
  </ul>
  
  <p>I was under the impression that for {confidence a -> bcd}, I could just do .4/.3 .... obviously incorrect, as support cannot be greater than 1. </p>
  
  <p>Could someone enlighten me?</p>