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Figure 1. Average precision of kNN vs. unique word count
Figure 3. Correlation between DF and IG values of words in Reuters
0.95
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0.75
IG
11-pt average precision
0.8
0.7
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CHI.max
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10000
8000
6000
Number of features (unique words)
4000
2000
0
1
10
100
DF
1000
10000
Figure 4. Correlation between DF and CHI values of words in Reuters
Figure 2. Average precision of LLSF vs. unique word count
1
0.95
DF-CHI plots
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0.85
0.01
0.75
CHI
11-pt average precision
0.8
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Number of features (unique words)
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