medium10 pts · first answer countshybrid-searchretrieval-metrics

Reciprocal rank fusion scores

You fuse BM25 and vector results with reciprocal rank fusion, score = sum of 1 / (60 + rank). Doc A is rank 1 in BM25 only. Doc B is rank 5 in both lists. Which ranks higher?

A.Doc B, about 0.031 vs 0.016B.Doc A, about 0.016 vs 0.008C.Doc A, because rank 1 always winsD.They tie, because both have a total rank of about 5

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Reciprocal rank fusion scores

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