Common
Discounted cumulative gain
Measure of ranking quality
Discounted cumulative gain
Discounted cumulative gain (DCG) is a measure of ranking quality in information retrieval. It is normalized so that it is comparable across queries, giving Normalized DCG (nDCG or NDCG). (N)DCG is used to measure effectiveness of search engine algorithms, recommender systems and related applications. Using a graded relevance scale of documents in a search-engine result set, DCG sums the usefulness, or gain, of the results discounted by their position in the result list. NDCG is DCG normalized by the maximum possible DCG of the result set when ranked from highest to lowest gain, thus adjusting for the different numbers of relevant results for different queries.
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