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Recall
Precision
M. Sc. Johannes Schildgen
2016-06-09
schildgen@cs.uni-kl.de
and
Hariboogle
Search
Hariboogle
Color-Rado
Search
Hariboogle
Search
Color-Rado
42 Results in 0,002 Seconds
?
?
Should
be
found
Was
found
Relevant Found
Relevant Found
Relevant Found
5 141
4246
Relevant Found
5 141
Precision:
|𝑹∩𝑭|
|𝑭|
4246
=
𝟒𝟏
𝟒𝟐
= 0,98 = 98%
„How many % of the found items are relevant?“
Hariboogle
Search
Precision:
|𝑹∩𝑭|
|𝑭|
= 1 Perfect!
Hariboogle
Color-Rado
Suche
Precision:
|𝑹∩𝑭|
|𝑭|
= 1 Perfect!
Hariboogle
Suche
Precision:
|𝑹∩𝑭|
|𝑭|
= 1 Perfect!
 No rubbish
 Only a few results
1 result
Improve Precision
• Find less rubbish (=> Relevance Feedback)
Precision:
|𝑹∩𝑭|
|𝑭|
Hariboogle
Search
Color-Rado
42 Results in 0,002 Seconds
Improve Precision
• Find less rubbish (=> Relevance Feedback)
Precision:
|𝑹∩𝑭|
|𝑭|
Hariboogle
Search
Color-Rado
42 Results in 0,002 Seconds
Relevant Found
5 141
Recall:
|𝑹∩𝑭|
|𝑹|
4246
=
𝟒𝟏
𝟒𝟔
= 0,89 = 89%
„How much % of the relevant items were found?“
Hariboogle
Search
Recall:
|𝑹∩𝑭|
|𝑹|
= 1 Perfect!
Hariboogle
Color-Rado
Search
Recall:
|𝑹∩𝑭|
|𝑹|
= 1 Perfect!
Hariboogle
Search
?
?
?
? ?
?
?
?
?
?
?
?
?
Recall:
|𝑹∩𝑭|
|𝑹|
= 1 Perfect!
 All relevant items were found
 A lot of rubbish
803214523509235*1012 Billion results
Improve Recall
• Find more relevant items (easier said than done)
Recall:
|𝑹∩𝑭|
|𝑹|
Conclusion
Precision:
|𝑹∩𝑭|
|𝑭|
Relevante Gefundene
Conclusion
Precision:
|𝑹∩𝑭|
|𝑭|
Recall:
|𝑹∩𝑭|
|𝑹|
Relevante Gefundene

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Precision and Recall