2013
DOI: 10.1371/journal.pone.0072854
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Abstract: In a time-series, memory is a statistical feature that lasts for a period of time and distinguishes the time-series from a random, or memory-less, process. In the present study, the concept of “memory length” was used to define the time period, or scale over which rare events within a physiological time-series do not appear randomly. The method is based on inverse statistical analysis and provides empiric evidence that rare fluctuations in cardio-respiratory time-series are ‘forgotten’ quickly in healthy subje… Show more

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Cited by 25 publications
(59 citation statements)
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References 27 publications
(48 reference statements)
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“…Memory in a time-series (e.g. respiratory rhythm) indicates how many steps we need to go forward to reach a point where the present state does not depend on its past (7,8). Thus controllability is affected by the concept of memory in a time-series; intuitively the control of a system with longer memory is also harder.…”
Section: Letter To Editormentioning
confidence: 99%
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“…Memory in a time-series (e.g. respiratory rhythm) indicates how many steps we need to go forward to reach a point where the present state does not depend on its past (7,8). Thus controllability is affected by the concept of memory in a time-series; intuitively the control of a system with longer memory is also harder.…”
Section: Letter To Editormentioning
confidence: 99%
“…Thus controllability is affected by the concept of memory in a time-series; intuitively the control of a system with longer memory is also harder. In this regard, we recently quantified memory in respiratory rhythm of patients with asthma and showed that it is significantly prolonged in patients with uncontrolled asthma in comparison with patients with controlled asthma (8). This suggested that it is more likely that a sudden stochastic event (e.g.…”
Section: Letter To Editormentioning
confidence: 99%
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“…Memory strength characterizes the correlation between neighboring or nearby elements: a positive memory strength indicates that a high-value (low-value) element is likely to be followed by some high-value (lowvalue) elements. Memory strength effects are observed in a large variety of real-world time series [7], such as natural phenomena (e.g., earthquake and daily precipitation) [8], online human activities (e.g., visits on movies, books and music) [9], physiological signals (e.g., respiratory and liver cirrhosis time series) [10], and so on. Such memory strength effects also play a significant role in modeling spatial mobility [11][12][13] and temporal activities [14,15] of human beings.…”
Section: Introductionmentioning
confidence: 99%