Power law for the calm-time interval of price changes

Details Power law for the calm-time interval of price changes Power law for the calm-time interval of price changes

2003-12-21

arxiv.org/abs/cond-mat/0312560v2

Physica A 336 (2004) 563-570

Physics

Condensed Matter

Statistical Mechanics

14 pages, 7 figures

Scientific paper

10.1016/j.physa.2003.12.054

In this paper, we describe a newly discovered statistical property of time series data for daily price changes. We conducted quantitative investigation of the {\it calm-time intervals} of price changes for 800 companies listed in the Tokyo Stock Exchange, and for the Nikkei 225 index over a 27-year period from January 4, 1975 to December 28, 2001. A calm-time interval is defined as the interval between two successive price changes above a fixed threshold. We found that the calm-time interval distribution of price changes obeys a power law decay. Furthermore, we show that the power-law exponent decreases monotonically with respect to the threshold. Keyword: econophysics, stock price changes, calm time interval, power-laws; PACS: 89.90.+n; 05.40.Df;

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