IRS13
Scientific Report No. IRS-13 Information Storage and Retrieval
Search Matching Functions
chapter
E. M. Keen
Harvard University
Gerard Salton
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III-~~
6 11
Relevant Non-Relevant
Documents Documents
Logical Average Number
of Concepts in 70.0 56.2
(Cosine) Documents.
Relevant Length
as Percentage l2[OCRerr].6%
of Non-Relevant
Numeric Average Sum of
[OCRerr]
Weights of Con- 1,2 1,057
(Cosine) cepts in Docu-
ment.
R[OCRerr]evax[OCRerr]t as ?er-
centage of Non- 119.8%
Relevant.
Average Sum of
*[OCRerr]1oJ---------------------
Squares of Weights 34, 32,243
of Concepts in
Document.
Relevant as Per-
centage of Non- 108.3%
Relevant.
I
Average values for factors that go into the denominator of the cosine corre-
lation comparing relevant and non-relevant documents for logical and numeric
vectors, from the results of Figure8 27 and 28.
Figure 30.