ISR10
Scientific Report No. ISR-10 Information Storage and Retrieval
The Query-Document Matching Function
chapter
Joseph John Rocchio
Harvard University
Gerard Salton
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
4-26
[OCRerr]umber
of
Documents n2
ni
T
0
- - - I-
1.0
Correlation
a) Hypothetical Doc.-Doc. Correlation Distribution
Showin[OCRerr] Density Test Points
f
n2
Number
of
Documents
n1
- - I - - -
U t
Correlation
½
b) Two Distributions which Fail the Density Test
Graphical Illustration of the Density Test
Fi[OCRerr]e 4.5
U