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Segmentation, alignment and statistical analysis of biosignals with application to disease classification

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We present a novel methodology for a comprehensive statistical analysis of approximately periodic biosignal data. There are two main challenges in such analysis: (1) the automatic extraction (segmentation) of cycles from long, cyclostationary biosignals and (2) the subsequent statistical analysis, which in many cases involves the separation of temporal and amplitude variabilities. The proposed framework provides a principled approach for statistical analysis of such signals, which in turn allows for an efficient cycle segmentation algorithm. This is achieved using a convenient representation of functions called the square-root velocity function (SRVF). The segmented cycles, represented by SRVFs, are temporally aligned using the notion of the Karcher mean, which in turn allows for more efficient statistical summaries of signals. We show the strengths of this method through various disease classification experiments. In the case of myocardial infarction detection and localization, we show that our method compares favorably to methods described in the current literature.
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Keywords: cyclostationary biosignal segmentation; disease classification; functional data analysis; gait; myocardial infarction

Document Type: Research Article

Affiliations: 1: Department of Statistics, The Ohio State University, Columbus, OH, USA 2: Department of Statistics, Florida State University, Tallahassee, FL, USA 3: Electrical and Computer Engineering, University of Iowa, Iowa City, IA, USA

Publication date: June 1, 2013

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