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The Normalized Compression Distance Is Resistant to Noise

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3 Author(s)
Manuel Cebrian ; Escuela Politecnica Superior, Univ. Autonoma de Madrid ; Manuel Alfonseca ; Alfonso Ortega

This correspondence studies the influence of noise on the normalized compression distance (NCD), a measure based on the use of compressors to compute the degree of similarity of two files. This influence is approximated by a first order differential equation which gives rise to a complex effect, which explains the fact that the NCD may give values greater than 1, observed by other authors. The model is tested experimentally with good adjustment. Finally, the influence of noise on the clustering of files of different types is explored, finding that the NCD performs well even in the presence of quite high noise levels

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IEEE Transactions on Information Theory  (Volume:53 ,  Issue: 5 )