Aittokallio, T.; Gyllenberg, M.; Nevalainen, O.; Polo, O. Testing for periodicity in signals: An application to detect partial upper airway obstruction during sleep. (English) Zbl 0994.92027 J. Theor. Med. 3, No. 4, 231-245 (2001). Summary: A simple method for detecting periodic components of unknown periodicity in a signal is presented. The method is based on spectral decomposition of signals using orthonormal functions. Traditionally, hypothesis testing together with harmonic functions is used, but we show that the same statistical properties are obtained for other systems of orthonormal functions as well. The appropriate behavior of the method is first demonstrated with simulation studies and then tested to identify visually determined clusters of high-frequency movements, which may repeat in synchrony with respiration during sleep. The good performance in the practical tests suggests that an automatic identification of these clusters could be based on Walsh functions. MSC: 92C55 Biomedical imaging and signal processing 62P10 Applications of statistics to biology and medical sciences; meta analysis 92C30 Physiology (general) Keywords:Fourier transforms; hypothesis testing; periodogram analysis; static charge-sensitive bed; upper airway resistance syndrome; Walsh transforms PDFBibTeX XMLCite \textit{T. Aittokallio} et al., J. Theor. Med. 3, No. 4, 231--245 (2001; Zbl 0994.92027) Full Text: DOI EuDML