Table 7
Comparing Retrieval Effectiveness of Different Relevance Levels in the Sentence-level co-occurrence Strategy
| Relevance level | Retrieved | Relevant | Precision |
| L1 T and A and M | 18 | 12 | 0.67 |
| L2 T and A | 69 | 42 | 0.61 |
| L3 T and M | 16 | 5 | 0.31 |
| L4 A and M | 48 | 24 | 0.50 |
| L5 T | 57 | 32 | 0.56 |
| L6 A | 501 | 191 | 0.38 |
| L7 M | 1433 | 167 | 0.12 |
| L8 T or A or M | 1021 | 188 | 0.18 |
| Total | 3163 | 661 | — |
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The second and third columns show the counts of retrieved and relevant documents, respectively. The computed precisions in the last column compare the retrieval effectiveness between different relevance levels. Same abbreviations used as in Table 2.
