Discounted Cumulative Gain




  • The premise of DCG is that highly relevant documents appearing lower in a search result list should be penalized as the graded relevance value is reduced logarithmically proportional to the position of the result. (View Highlight)
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  • Wang et al. (2013)[3] gave theoretical guarantee for using the logarithmic reduction factor in Normalized DCG (NDCG). The authors show that for every pair of substantially different ranking functions, the NDCG can decide which one is better in a consistent manner. (View Highlight)
  • An alternative formulation of DCG[4] places stronger emphasis on retrieving relevant documents: (View Highlight)
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