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Multiscale entropy-based methods for heart rate variability complexity analysis

Silva, Luiz Eduardo Virgilio; Cabella, Brenno Caetano Troca - In: Physica A: Statistical Mechanics and its Applications 422 (2015) C, pp. 143-152

Physiologic complexity is an important concept to characterize time series from biological systems, which associated to … complexity metrics as function of time scales. Complexity metrics are derived from nonadditive entropy supported by generation of … surrogate data, i.e. SDiffqmax, qmax and qzero. In order to access accuracy of proposed complexity metrics, receiver operating …

Persistent link: https://www.econbiz.de/10011194017

EMD based refined composite multiscale entropy analysis of complex signals

Wang, Jing; Shang, Pengjian; Xia, Jianan; Shi, Wenbin - In: Physica A: Statistical Mechanics and its Applications 421 (2015) C, pp. 583-593

Multiscale entropy (MSE) is an effective method to measure the complexity of signals from complex systems, which has … complexity measurement. Thus we introduce an empirical mode decomposition based RCMSE, called EMD–RCMSE to first eliminate such … effects of trends and then measure the complexity of signals. It is validated from simulated signals and has good estimation …

Persistent link: https://www.econbiz.de/10011194044

Complexity measures and self-similarity on spreading depression waves

Piqueira, José Roberto C.; Lima, Vera Maura Fernandes de; … - In: Physica A: Statistical Mechanics and its Applications 401 (2014) C, pp. 271-277

the circular wave formations. Shiner–Davison–Landsberg (SDL) complexity measure framework has been used in several … were collected in two different spatial scales. The SDL complexity was calculated for the data and two main results …

Persistent link: https://www.econbiz.de/10010871856

The effect of microscopic correlations on the information geometric complexity of Gaussian statistical models

Ali, S.A.; Cafaro, C.; Kim, D.-H.; Mancini, S. - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 16, pp. 3117-3127

We present an analytical computation of the asymptotic temporal behavior of the information geometric complexity (IGC … connection between (micro)correlations and (macro)complexity in Gaussian statistical dynamical systems. …

Persistent link: https://www.econbiz.de/10010871921

On the relation between correlation dimension, approximate entropy and sample entropy parameters, and a fast algorithm for their calculation

Zurek, Sebastian; Guzik, Przemyslaw; Pawlak, Sebastian; … - In: Physica A: Statistical Mechanics and its Applications 391 (2012) 24, pp. 6601-6610

these complexity algorithms and show explicitly that the above parameters are intimately connected and mutually … can be used in medical applications of complexity theory, as it can calculate all three parameters for a realistic …

Persistent link: https://www.econbiz.de/10010872055

A power-law distribution for tenure lengths of sports managers

Aidt, Toke S.; Leong, Bernard; Saslaw, William C.; … - In: Physica A: Statistical Mechanics and its Applications 370 (2006) 2, pp. 697-703

We show that the tenure lengths for managers of sport teams follow a power law distribution with an exponent between 2 and 3. We develop a simple theoretical model which replicates this result. The model demonstrates that the empirical phenomenon can be understood as the macroscopic outcome of...

Persistent link: https://www.econbiz.de/10010872143

Scale-free phenomenon in industries in China

Tang, Da-Hai; Chen, Bo-Kui; Gao, Ya-Chun; Wang, Bing-Hong - In: Physica A: Statistical Mechanics and its Applications 392 (2013) 23, pp. 5914-5919

In this paper, we investigate the data of industries in China and find that the frequency distributions of fixed assets and fixed-assets’ investment of industries obey power laws. We show that these power-law modes can be explained by the rules of the Simon Model, rather than the existing...

Persistent link: https://www.econbiz.de/10010872681

The shape of the past in the World Wide Web: Scale-free patterns and dynamics

Jovani, Roger; Fortuna, Miguel A. - In: Physica A: Statistical Mechanics and its Applications 385 (2007) 2, pp. 683-688

Human societies accumulate a great deal of information about past events. People make reference to things that happened in time in different ways and record them in multiple media. We have studied the current use of this information by analysing the frequency of occurrence of numbers associated...

Persistent link: https://www.econbiz.de/10010873322

The role of propagating stress waves on a geophysical scale: Evidence in terms of nonextensivity

Minadakis, G.; Potirakis, S.M.; Stonham, J.; Nomicos, C.; … - In: Physica A: Statistical Mechanics and its Applications 391 (2012) 22, pp. 5648-5657

Laboratory experiments have shown that, during a fracture, the breaking of a bond launches a propagating stress wave which may trigger the breaking of other bonds. We examine here the possibility that the same holds on a geophysical scale. Based on a nonextensive approach, we examine whether the...

Persistent link: https://www.econbiz.de/10010873391

Multiscale entropy analysis of human gait dynamics

Costa, M.; Peng, C.-K.; L. Goldberger, Ary; Hausdorff, … - In: Physica A: Statistical Mechanics and its Applications 330 (2003) 1, pp. 53-60

We compare the complexity of human gait time series from healthy subjects under different conditions. Using the … recently developed multiscale entropy algorithm, which provides a way to measure complexity over a range of scales, we observe … that normal spontaneous walking has the highest complexity when compared to slow and fast walking and also to walking paced …

Persistent link: https://www.econbiz.de/10010873422