title: How to implement a trending recommender in mahout
body: <p>I am using mahout core to implement several recommender functions. Among others, I want to implement a "trending products" recommendation function.
  Usually I would use something like Z-score, but I want to stick to things mahout provides and I could not find anything in the libabries.</p>
  
  <p>Does anybody know, how to implement a trending function using mahout?</p>
  
  <p>EDIT: What I try to accomplish:
  I want to implement a general purpose recommender engine, that should offer <strong>a)</strong> recommendations based on the the user history and <strong>b)</strong> recommendations about currently trending products. therefore products that got more clicks in the last N days then <em>usual</em>. </p>
  
  <p>This question is only targeting <strong>b)</strong></p>