CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Main test results
chapter
Cyril Cleverdon
Michael Keen
Cranfield
An investigation supported by a grant to Aslib by the National Science Foundation.
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
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FIGURE 4. 706T
Index Language II.7.a ([OCRerr]hup:e Concepts. Co-ordlnate and Collateral (Selected).
Exhauativlty of Indexing 3
Search Rule A
Document Relevance I - 4
Ntlmber of Documents in Collecti,[OCRerr]r. 200 (Subset 1)
Number of Questions 42 (Sub[OCRerr],'. 2}
Number of Relevant Documents 198
Generality Number 23.6
Coord -
Inatlon Documents RecaLl Precision FaUout
Level Retrieved
Rel. Non-rci. Ratio
a/a+c Ratio Ratio
a/a+b b/b+d x y z
I 137
2 75 1.532 69.2%
318 [OCRerr].2% 42 43 42
23 37.9% 18.682%
3 50 11.6% 19.1% 33 41 41
14 38 38
I 4 32 33
o 0 ] 3.0% 31.5% 3.877%
4 0.810%
8
6 9
o I 40.0%
I 0.5% IO0. o% 0,110%
8 0.000% 1 20 2O
7 o I o I 0 9 9
0 3 3
Coordination)
FIGURE 4.707T
Index Language II.8.a
Exhauelivtty af Indexing 3
Search Rule A
DOcument Relevance l - 4
Number of Documents in Collection
Number of Questions 42 (Subset 2)
Number of Relevant Documents 198
Generality Number 23.6
Coord- I
lnation I
Level I
i
H t
, I
(Simple Concepts. Species. Superordinate, Coordinate and Collateral
(Selected). Coordination)
200 (Subset I)
DocumerrtB _[OCRerr]ecall Precision Fallout
Re[OCRerr]rleved Ratio Ratio Ratio x y u
Rel. Non-ret. a/a+c a/a+b b/b+d
159 2.133
99 355
38 123
14 33
5 il
0
0 0
a0.3% 8.9% 28.012%
50.0% 14.1% 7.370%
19.2% 23.6% 1.500%
7.1% 29.8% 0.402%
2.5% 38.5% 0.088%
0.0% o,o% o.o12%
42 42 42
40 41 41
33 38 38
I0 32 32
2 20 20
I 9 8
0 3 3
FIGURE 4. 700T
Index Language ll.9.a (Simple Concepts. First alphabetical collateral (Selected). Coordination).
ExhauaUvity of IndexLug 3
Search Rule A
Document Relevance 1 - 4
Number of Documents in CollecIlon 200 (Subset 1)
Number of Questions 42 (Subset 2)
Number of Relevant Doct[OCRerr]mente 198
Generality Number 23.6
Coord- Documents
InaUon Recall Precision Fallout
Level Retrieved
Rel. Non-rel. Ratio
a/a+c Ratio
a/a+b Ratio
b/b+d x y
1 135
2 1.524
75 88.2% 8.l%
37.9% 18,585% 42 42 42
3 285
37 45 20.2%
18,7% 3.809%
45.1% 33
0.549% 41 41
19
4 38
13 38
fi 5
I 5.8% 68.4%
0.5% 0.073% 8 32 32
6 2
0 0 83.6% 0.024% 3 20 20
7 0 9 8
0 o o 3 8