title: Mean Percentile Ranking (MPR) explanation
body: <p>I am trying to use MPR as a metric to evaluate my recommendation system based on implicit feedback. Can somebody please explain MPR? I have gone through this <a href="http://yifanhu.net/PUB/cf.pdf" rel="nofollow noreferrer">paper</a> </p>
  
  <p>However, I can't seem to get an intuitive understanding.</p>
  
  <p>Any help would be appreciated.</p>
  
  <p>EDIT : I went through <a href="http://research.microsoft.com/en-us/um/people/manik/events/xc15/Slides/noam.pdf" rel="nofollow noreferrer">Microsoft's research on metrics for recommendation engine metrics</a> </p>
  
  <p>It is recommended that MPR is recommended when we're looking for one 'positive' result. Can somebody also explain why that is the case?</p>
  
  <p>EDIT 2 : <a href="https://i.stack.imgur.com/UbM80.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UbM80.png" alt="Definition of MPR"></a></p>