From: Integrating unified medical language system and association mining techniques into relevance feedback for biomedical literature search
Sentence
CNT (Q)S i
CNT ({1})S i
CNT(Q ∪ {1})S i
S1
1/3
1
S2
0
S3
2/3
S4
S5
Sum
5/3 (f W Q )
4 (f {1})
1 (f W Q{1} )