A New Biomedical Passage Retrieval Framework for Laboratory Medicine: Leveraging Domain-specific Ontology, Multilevel PRF, and Negation Differential Weighting

Table 8

Evaluation results by different ranking schemes on abnormal cases.

Ranking scheme	nDCG@1		nDCG@5		nDCG@10
TF-IDF	0.8108	—	0.4418	—	0.3384	—
BM25	0.8156	+0.59%	0.4410	−0.18%	0.3476	+2.72%
LM	0.8312	+1.91%	0.4569	+3.61%	0.3399	−2.22%
Proposed without NEG	0.8378	+0.79%	0.4583	+0.31%	0.3417	+0.53%
Proposed with NEG	0.8483	+1.25%	0.4691	+2.36%	0.3533	+3.39%

A significant improvement () over the baseline. A significant improvement over baseline and methods marked with .