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.
vII-~~
Case 15 - The Modified Two-Level Search Scheme with 8 Cate[OCRerr]ories
Based on the Clustering of the First 25 [OCRerr]ueries with the
Ftill 35 Queries Used as a Test Collection of Oueries.
n c K(c,n) M(c,n) P(c,n) [OCRerr](c,n)
3 .20 35 1+.97
6 .20 33 9.73 .57 .53
9 .20 29 l3.[OCRerr]5 .65
12 .20 28 19.86 .72 .62
3 .30 33 9.30 .63
6 .30 23 1l[OCRerr].35 .77 .53.
9 .30 12 21.00 .83 .67
12 .30 9 25.00 .92 .78
3 15 6.[OCRerr]7 .71 .70
6 7 19.00 .90 .57
9 1 10.00 .89 1.00
12 1 19.00 1.00 1.00
3 .50 3 [OCRerr].67 .56 1.00
6 .50 1 8.00 .83 1.33
9 .50 0 0 0 0
12 .50 0 0 0 0
3 .6o 1 3.00 .33 2.00
6 .60 0 0 0 0
9 .60 0 0 0 0
12 .60 0 0 0 0
TOTALS 231 = 12.29 RT = .58
= .65