Search Engines: Information Retrieval in Practice. Books. Croft, W. B., Metzler, D. and Strohman, T., Pearson Education (expected 2009).
Fortunately you can download the evaluation chapter as one of the samples here:
http://www.pearsonhighered.com/croft1epreview/samples.html
Paul.
------------------------------------------------------- Dr. Paul Clough (Lecturer in Information Systems)
Department of Information Studies University of Sheffield Regent Court Sheffield S1 4DP Tel: +44 (0)114 2222664 Fax: +44 (0)114 2780300 Email: p.d.clough at sheffield.ac.uk Web: http://ir.shef.ac.uk/cloughie/ -------------------------------------------------------
Quoting Adam Funk <a.funk at dcs.shef.ac.uk>:
> [18/04/08 08:39] Daniel Zeman wrote:
> > Thierry Fontenelle napsal(a):
> >> Precision: The number of correct responses divided by the total number
> >> of actual responses.
> >>
> >> Recall: The number of correct responses divided by the total number of
> >> possibly correct responses.
>
> > Alternative wording I usually tell my students:
> >
> > P = number of things I correctly found / number of things I found
> > R = number of things I correctly found / number of things I should have
> > found
> >
> > ("correctly found" = "I found it" AND "I should have found it")
>
> Here's another way to look at it, which I sometimes find useful:
>
> P = true_positives / (true_positives + false_positives)
>
> R = true_positives / (true_positives + false_negatives)
>
>
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