THE ANOMALOUS BEHAVIOUR OF PRECISION IN THE SWETS MODEL, AND ITS RESOLUTION

THE ANOMALOUS BEHAVIOUR OF PRECISION IN THE SWETS MODEL, AND ITS RESOLUTION M. H. Heine has shown that if one follows the retrieval procedure associated with Swets' model of an information retrieval system it is possible that the inverse relationship between Recall and Precision may not hold. In this paper we extend Heine's result to the case where the criterionparameter can assume discrete as well as continuous values. A plausible model of this kind is described and it is shown that for that model, Recall and Precision are in fact inversely related. The condition under which this relation may possibly not hold is then examined, and the conclusion is reached that this behaviour is an effect of the customary retrieval procedure, rather than anything intrinsic in the Swets model itself. An alternative logic is proposed in which the expected relationship is restored, as well as performance improved. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Documentation Emerald Publishing

THE ANOMALOUS BEHAVIOUR OF PRECISION IN THE SWETS MODEL, AND ITS RESOLUTION

Journal of Documentation, Volume 30 (4): 7 – Apr 1, 1974

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0022-0418
DOI
10.1108/eb026585
Publisher site
See Article on Publisher Site

Abstract

M. H. Heine has shown that if one follows the retrieval procedure associated with Swets' model of an information retrieval system it is possible that the inverse relationship between Recall and Precision may not hold. In this paper we extend Heine's result to the case where the criterionparameter can assume discrete as well as continuous values. A plausible model of this kind is described and it is shown that for that model, Recall and Precision are in fact inversely related. The condition under which this relation may possibly not hold is then examined, and the conclusion is reached that this behaviour is an effect of the customary retrieval procedure, rather than anything intrinsic in the Swets model itself. An alternative logic is proposed in which the expected relationship is restored, as well as performance improved.

Journal

Journal of DocumentationEmerald Publishing

Published: Apr 1, 1974

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