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A time series pre-processing methodology with statistical and spectral analysis for classifying non-stationary stochastic biosignals

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Abstract

Biosignal classification is an important non-invasive diagnosis tool in biomedical application, e.g. electrocardiogram (ECG), electroencephalogram (EEG), and electromyogram (EMG) that helps medical experts to automatically classify whether a sample of biosignal under test/monitor belongs to the normal type or otherwise. Most biosignals are stochastic and non-stationary in nature, that means their values are time dependent and their statistics vary over different points of time. However, most classification algorithms in data mining are designed to work with data that possess multiple attributes to capture the non-linear relationships between the values of the attributes to the predicted target class. Therefore, it has been a crucial research topic for transforming univariate time series to multivariate dataset to fit into classification algorithms. For this, we propose a pre-processing methodology called statistical feature extraction (SFX). Using the SFX we can faithfully remodel statistical characteristics of the time series via a sequence of piecewise transform functions. The new methodology is tested through simulation experiments over three representative types of biosignals, namely EEG, ECG and EMG. The experiments yield encouraging results supporting the fact that SFX indeed produces better performance in biosignal classification than traditional analysis techniques like Wavelets and LPC-CC.

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Notes

  1. http://www.mathworks.com/help/dsp/ref/lpctofromcepstralcoefficients.html.

  2. https://en.wikipedia.org/wiki/Electromyography#Abnormal_results.

  3. http://fourier.eng.hmc.edu/e161/lectures/Haar/index.html.

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Acknowledgments

The authors are thankful for the financial support from the research grant “Rare Event Forecasting and Monitoring in Spatial Wireless Sensor Network Data,” Grant No. MYRG2014-00065-FST, offered by the University of Macau, FST, and RDAO. Special thanks go to the graduate students, Mr. Lan Kun, Mr. Paul Sun of M.Sc. Software Engineering who contributed to the programming and conducting the experiments.

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Authors and Affiliations

  1. Department of Computer and Information Science, University of Macau, Macau SAR, China

    Simon Fong

  2. Department of Multimedia Engineering Dongguk University, Seoul, South Korea

    Kyungeun Cho

  3. Department of Computer Science, Lakehead University, Thunder Bay, Canada

    Osama Mohammed, Jinan Fiaidhi & Sabah Mohammed

Authors
  1. Simon Fong
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  2. Kyungeun Cho
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  3. Osama Mohammed
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  4. Jinan Fiaidhi
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  5. Sabah Mohammed
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Corresponding author

Correspondence to Simon Fong.

Appendix

Appendix

See Table 2.

Table 2 Overview and description of applied Weka classifiers
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Fong, S., Cho, K., Mohammed, O. et al. A time series pre-processing methodology with statistical and spectral analysis for classifying non-stationary stochastic biosignals. J Supercomput 72, 3887–3908 (2016). https://doi.org/10.1007/s11227-016-1635-9

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