The Annals of Applied Statistics
- Ann. Appl. Stat.
- Volume 7, Number 4 (2013), 2384-2401.
Fréchet means of curves for signal averaging and application to ECG data analysis
Signal averaging is the process that consists in computing a mean shape from a set of noisy signals. In the presence of geometric variability in time in the data, the usual Euclidean mean of the raw data yields a mean pattern that does not reflect the typical shape of the observed signals. In this setting, it is necessary to use alignment techniques for a precise synchronization of the signals, and then to average the aligned data to obtain a consistent mean shape. In this paper, we study the numerical performances of Fréchet means of curves which are extensions of the usual Euclidean mean to spaces endowed with non-Euclidean metrics. This yields a new algorithm for signal averaging and for the estimation of the time variability of a set of signals. We apply this approach to the analysis of heartbeats from ECG records.
Ann. Appl. Stat., Volume 7, Number 4 (2013), 2384-2401.
First available in Project Euclid: 23 December 2013
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Bigot, Jérémie. Fréchet means of curves for signal averaging and application to ECG data analysis. Ann. Appl. Stat. 7 (2013), no. 4, 2384--2401. doi:10.1214/13-AOAS676. https://projecteuclid.org/euclid.aoas/1387823324