Difference between revisions of "Normalized discounted cumulative gain"
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Revision as of 15:52, 29 March 2011
The discounted cumulative gain (DCG) accumulated at a particular rank position is defined as:
Normalized DCG (nDCG) is a way to calculate this measure across multiple queries, the results for which might all be of different length. nDCG is computed as:
The nDCG values for all queries can be averaged to obtain a measure of the average performance of a search engine's ranking algorithm.