Journal
EUROPHYSICS LETTERS
Volume 69, Issue 4, Pages 664-670Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2004-10384-1
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Funding
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0837678] Funding Source: National Science Foundation
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For many externally driven complex systems neither the noisy driving force, nor the internal dynamics are a priori known. Here we focus on systems for which the time-dependent activity of a large number of components can be monitored, allowing us to separate each signal into a component attributed to the external driving force and one to the internal dynamics. We propose a formalism to capture the potential multiscaling in the fluctuations and apply it to the high-frequency trading records of the New York Stock Exchange. We find that on the time scale of minutes the dynamics is governed by internal processes, while on a daily or longer scale the external factors dominate. This transition from internal to external dynamics induces systematic changes in the scaling exponents, offering direct evidence of non-universality in the system.
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