ISR11
Scientific Report No. ISR-11 Information Storage and Retrieval
A Modified Two-Level Search Algorithm Using Request Clustering
chapter
V. R. Lesser
Harvard University
Gerard Salton
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
v'I-37
Case 8 - The Modified T!TO-Level Search Scheme with 8 Categories Based
on the Clustering of 200 Random Queries with the Last 10
Queries Used as a Test Collection of Queries.
n c K(c,n) M(c,n) [OCRerr]P(c,n) R(c,n)
3 .20 10 3.00 .43 .35
6 .20 10 7.30 .55 .52
9 .20 10 17.70 .60 .42
12 .20 10 27.10 .77 .70
3 .30 10 10.80 .67 .28
6 .30 8 25.88 .77 .4i
9 30 3 26.33 .81 .67
12 .30 2 33.50 .82 1.00
3 5 11.50 .92
6 2 30.00 .80 0
Q 0 0 .83 0
12 0 0 0 0
3 .50 1 3.00 0 0
6 .50 0 0 .33 0
9 .50 0 0 0 0
12 .50 0 0 0 0
3 .60 0 0 0 0
6 .60 0 0 0 0
9 .60 0 0 0 0
12 .60 0 0 0 0
TOTALS 71 = 15.96 = .66 RT = .45