LD-SPatt: large deviations statistics for patterns on Markov chains

Statistics on Markov chains are widely used for the study of patterns in biological sequences. Statistics on these models can be done through several approaches. Central limit theorem (CLT) producing Gaussian approximations are one of the most popular ones. Unfortunately, in order to find a pattern...

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Bibliographic Details
Published in:Journal of computational biology Vol. 11; no. 6; p. 1023
Main Author: Nuel, G
Format: Journal Article
Language:English
Published: United States 2004
Subjects:
Computational Biology
Data Interpretation, Statistical
Markov Chains
Probability
Sequence Analysis, DNA - statistics & numerical data
Sequence Analysis, Protein - statistics & numerical data
Software
ISSN:1066-5277
Online Access:Get more information
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Summary:Statistics on Markov chains are widely used for the study of patterns in biological sequences. Statistics on these models can be done through several approaches. Central limit theorem (CLT) producing Gaussian approximations are one of the most popular ones. Unfortunately, in order to find a pattern of interest, these methods have to deal with tail distribution events where CLT is especially bad. In this paper, we propose a new approach based on the large deviations theory to assess pattern statistics. We first recall theoretical results for empiric mean (level 1) as well as empiric distribution (level 2) large deviations on Markov chains. Then, we present the applications of these results focusing on numerical issues. LD-SPatt is the name of GPL software implementing these algorithms. We compare this approach to several existing ones in terms of complexity and reliability and show that the large deviations are more reliable than the Gaussian approximations in absolute values as well as in terms of ranking and are at least as reliable as compound Poisson approximations. We then finally discuss some further possible improvements and applications of this new method.
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ISSN:1066-5277
DOI:10.1089/cmb.2004.11.1023