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Mathematical Problems in Engineering
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2015
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Article
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Tab 2
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Research Article
Recommending High Utility Queries via Query-Reformulation Graph
Table 2
Comparison of document relevance of three methods. (The percentages in the parentheses are the improvement of our QRG method over the corresponding methods).
Method
SDF
DF
QRG
@5
0.614 (10.4%)
0.634 (6.8%)
0.678
@10
0.562 (11.8%)
0.578 (8.8%)
0.629
@15
0.490 (21.7%)
0.513 (16.2%)
0.596
@20
0.440 (30.4%)
0.453 (26.7%)
0.573
DCG@5
2.693 (9.4%)
2.780 (5.9%)
2.945
DCG@10
3.870 (10.6%)
3.985 (7.4%)
4.279
DCG@15
4.529 (16.8%)
4.716 (12.2%)
5.290
DCG@20
5.022 (22.5%)
5.180 (18.7%)
6.150