ISR10
Scientific Report No. ISR-10 Information Storage and Retrieval
Evaluation of Document Retrieval Systems
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.
At this point, recall and precision functi&[OCRerr]s may be defined
for the results of a retrieval operation with respect to a particular
query. In particular, let the ranks of each member of the set of
relevant documents D resulting from applying M to £q x be
specified as:
[OCRerr](i) for i =
0
where [OCRerr]i + 1) >[OCRerr]i).
In this case:
and
(
0 for 1 <x<[OCRerr]1)
i
rq(x) for
n
0
I for x >0(n_)`
(0 for 1[OCRerr]x[OCRerr][OCRerr]1)
Pq(X) for [OCRerr](i) [OCRerr] x [OCRerr] [OCRerr]i+1)
for x >[OCRerr]n_)
At this point recall and precision error functions may be
defined by the equations:
recaU error $(r*'(x) - rq(x))[OCRerr]x (5.16)
x=1
precision error = (5.17)
f (p*(x) - Pq(X))dX
x=1