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Characterization of Sleep Stages by Correlations of Heartbeat Increments
Jan W. Kantelhardt, Yosef Ashkenazy, Plamen Ch. Ivanov +5
We study correlation properties of the magnitude and the sign of the increments in the time intervals between successive heartbeats during light sleep, deep sleep, and REM sleep us…
Identifying Business Sectors from Stock Price Fluctuations
Parameswaran Gopikrishnan, Bernd Rosenow, Vasiliki Plerou +1
Firms having similar business activities are correlated. We analyze two different cross-correlation matrices C constructed from (i) 30-min price fluctuations of 1000 US stocks for…
Hydrogen-Bonded Liquids: Effects of Correlations of Orientational Degrees of Freedom
G. Franzese, M. Yamada, H. E. Stanley
We improve a lattice model of water introduced by Sastry, Debenedetti, Sciortino, and Stanley to give insight on experimental thermodynamic anomalies in supercooled phase, taking i…
Scale Invariance in the Nonstationarity of Physiological Signals
Pedro Bernaola-Galvan, Plamen Ch. Ivanov, Luis A. Nunes Amaral +2
We introduce a segmentation algorithm to probe temporal organization of heterogeneities in human heartbeat interval time series. We find that the lengths of segments with different…
Magnitude and Sign Correlations in Heartbeat Fluctuations
Yosef Ashkenazy, Plamen Ch. Ivanov, Shlomo Havlin +3
We propose an approach for analyzing signals with long-range correlations by decomposing the signal increment series into magnitude and sign series and analyzing their scaling prop…
Classes of behavior of small-world networks
Luis A. Nunes Amaral, Antonio Scala, Marc Barthelemy +1
Small-world networks are the focus of recent interest because they appear to circumvent many of the limitations of either random networks or regular lattices as frameworks for the…