✦ LIBER ✦

Revisiting sample entropy analysis

✍ Scribed by R.B. Govindan; J.D. Wilson; H. Eswaran; C.L. Lowery; H. Preißl

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 180 KB
Volume: 376
Category: Article
ISSN: 0378-4371
DOI: 10.1016/j.physa.2006.10.077

No coin nor oath required. For personal study only.

✦ Synopsis

We modify the definition of sample entropy (SaEn) by incorporating a time delay between the components of the block (from which the densities are estimated) and show that the modified method characterizes the complexity of the system better than the original version. We apply the modified SaEn to the standard deterministic systems and stochastic processes (uncorrelated and long range correlated (LRC) processes) and show that the underlying complexity of the system is better quantified by the modified method. We extend this analysis to the RR intervals of the normal and congestive heart failure (CHF) subjects (available via www.physionet.org) and show that there is a good degree of separation between the two groups.

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