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Ranking quality (MRR and NDCG)
Measure how well search or retrieval ranks relevant results.
AI evaluationHow it's worked out
- NDCG = DCG ÷ ideal DCG, gain 2^rel − 1. MRR = mean of 1 ÷ rank of the first relevant result
- Graded relevance judged consistently
NoteNDCG rewards putting the best results first. Use the same cut-off (number of results) for every query.
Source: Järvelin and Kekäläinen (2002); TREC evaluation measures
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