IRS13
Scientific Report No. IRS-13 Information Storage and Retrieval
Appendix A: Recall-Precision Tables
appendix
Harvard University
Gerard Salton
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
AA
Hierarchy
Thesaurus-3
Brothers
R P
0.1 o.8iii
0.2 0.6647
0.3 0.6075
O.[OCRerr] 0.5297
0.5 0.4318
o.6 0.3673
0.7 0.3158
o.8 0.2672
0.9 0.2277
1.0 o.i6i8
RNK REC= o.2086
LOG PRE= 0.5720
NOR REC= 0.9220
NOR PRE 0.6972
Hierarchy
Thesaurus-3
Cross RE[OCRerr][OCRerr]rences
____________________ .I[OCRerr]
R P
0.1 0.8378
0.2 0.7162
0.3 0.6418
o.4 0.5690
0.5 0.4754
o.6 0.4196
0.7 0.3756
o.8 0.3048
0.9 0.2231
1.0 0.1292
RNK REC 0.2382
LOG PRE 0.6020
NOR REC 0.9229
NOR PRE 0.7134
Hierarchy
The saurus-3
All Relations
R P
0.1 0.8758
0.2 0.7642
0.3 0.6720
o.4 o.s94o
0.5 o.5o66
o.6 0.4208
0.7 0.3667
o.8 0.3195
0.9 0.2451
1.0 0.1754
RNK REC= 0.2666
LOG PRE= 0.6207
NOR REC o.9446
NOR PRE 0.7506
Stem Concon
Freq. 6 - 100
K = o.45
Stem Concon
Freq. 3 - 50
K = [OCRerr].60
R P R P
0.1 o.8065 0.1 0.7709
0.2 0.6796 0.2 0.6510
0.3 0.6322 0.3 0.6022
o.4 o.S8ii o.4 o.[OCRerr]426
0.5 0.4992 0.5 o.455o
0.6 0.4010 o.6 0.3679
0.7 0.2996 0.7 0.2803
o.8 0.2373 o.8 0.2261
0.9 0.1626 0.9 0.1517
1.0 0.0773 1.0 0.0782
RNK REC= 0.1802 RNK REC 0.1781
LOG PRE- o.5688 LOG [OCRerr]RE= 0.5592
NOR REC= 0.8900 NOR REC 0.8870
NOR PRE= 0.6692 NOR PRE= o.6585