Information Technology Reference
In-Depth Information
0.6
0.5
0.4
0.3
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0.1
0.0
0.0
0.1
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Baseline effectiveness
F
IGURE
3.
Fo r each query on the
FINNEGAN
data,original effectiveness versus
improvement.
0.3
0.2
0.1
0.0
0.0
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Baseline effectiveness
F
IGURE
3.
Averageimprovement against original effectiveness, for queries
on the
FINNEGAN
data.Each triangle is the averageover a rangeof0.05.
Thus, for example, the averageimprovementforqueries with effectiveness in
therange 0.20 to 0.25 is 0.166.
Fig. 15.4
Correlation. In the
upper
figure, no clear correlation can be seen between the two vari-
ables. In the
lower
figure, the same data is revisualized by plotting the average improvement in
each of 20 sub-ranges. In this figure, averaging has removed the extreme data points and the trend
is clear—there is no correlation
