CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Methods for presentation of results
chapter
Cyril Cleverdon
Michael Keen
Cranfield
An investigation supported by a grant to Aslib by the National Science Foundation.
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
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lOOx "-. \ X "[OCRerr] ", \ \, \
eo, "x \ "x. :"o
,,\ \ \
0 40 0 80
SFZCIEZCITY
100
FIGURE 3. 10P PLOT OF RECALL AND SPECIFICITY (ON A LINEAR
., SCALE) SHOWING TILE 'EFFECTIVENESS' LINES
100
8(:
R
E
C
L
L 4C
20
MEASURE O[OCRerr] F[OCRerr]RZT CURVES
o° o o [OCRerr] [OCRerr][OCRerr] [OCRerr]
'I;- 4' 4-:-I- [OCRerr]=: [OCRerr]-: ±--[OCRerr]'4: -[OCRerr]-' ' '-i,1[OCRerr][OCRerr] [OCRerr] ''
T "[OCRerr]:[OCRerr] [OCRerr]'[OCRerr]'-[OCRerr] '[OCRerr]": ![OCRerr] .... +÷ ----[OCRerr]i[OCRerr]- -i 'it[OCRerr], 'a!
[OCRerr]d
20 40 60 80 100
PR[OCRerr]ZSTO[OCRerr]
FIGURE 3. liP PLOT OF RECALL AND PRECISION AS FIGURE 3.4P
SHOWING 'MEASURE OF MERIT' CURVES