Testing the stationarity and normality of paediatric aspiration signals

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Abstract

Ninety-four aspiration signals were collected with a single-axis accelerometer placed infero-anterior to the thyroid notch from 23 children with Dysphagia. It was found that only 62% of aspiration signals can be considered stationary over short finite time windows. Further, 96% of aspiration signals violated normality to varying degrees. Nonstationarity was attributed to time-varying variance structure while departure from normality was linked to leptokurtic (more peaked than a normal distribution) amplitude distributions. Conventional assumptions of stationarity and normality do not simultaneously hold true for aspiration signals. Implications for automatic detection are mentioned.

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Chau, T., Casas, M., Berall, G., & Kenny, D. (2002). Testing the stationarity and normality of paediatric aspiration signals. In Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Vol. 1, pp. 186–187). https://doi.org/10.1109/iembs.2002.1134449

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