SP500215
NIST Special Publication 500-215: The Second Text REtrieval Conference (TREC-2)
On Expanding Query Vectors with Lexically Related Words
chapter
E. Voorhees
National Institute of Standards and Technology
D. K. Harman
:1
C"
A unexpanded
A expanded
0.0 0.2 0.4
0.6 0.8 1.0
Recall
5
.5
a
Figure 3: Effectiveness of expanded versus unexpanded routing queries on test documents (disk 3).
½ A unexpanded
A expanded
0.0 0.2 0.4 0.8 0.8 1.0
Racall
Figure 4: Effectiveness of expanded versus unexpanded ad hoc queries.
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