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A Re-Examination of the Distance-Weighted k-Nearest Neighbor Classification Rule

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3 Author(s)
Macleod, J.E.S. ; Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom ; Luk, A. ; Titterington, D.M.

It was previously proved by Bailey and Jain that the asymptotic classification error rate of the (unweighted) k-nearest neighbor (k-NN) rule is lower than that of any weighted k-NN rule. Equations are developed for the classification error rate of a test sample when the number of training samples is finite, and it is argued intuitively that a weighted rule may then in some cases achieve a lower error rate than the unweighted rule. This conclusion is confirmed by analytically solving a particular simple problem, and as an illustration, experimental results are presented that were obtained using a generalized form of a weighting function proposed by Dudani.

Published in:

Systems, Man and Cybernetics, IEEE Transactions on  (Volume:17 ,  Issue: 4 )

Date of Publication:

July 1987

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