https://doi.org/10.1140/epjst/e2015-50328-y
Regular Article
Time-dependent scaling patterns in high frequency financial data
1 Department of Computer Science, University College London, Gower Street, London, WC1E 6BT, UK
2 Department of Mathematics, King's College London, The Strand, London, WC2R 2LS, UK
3 Systemic Risk Centre, London School of Economics and Political Sciences, London, WC2A2AE, UK
a e-mail: n.morales.11@ucl.ac.uk
Received: 16 December 2015
Revised: 23 April 2016
Published online: 26 October 2016
We measure the influence of different time-scales on the intraday dynamics of financial markets. This is obtained by decomposing financial time series into simple oscillations associated with distinct time-scales. We propose two new time-varying measures of complexity: 1) an amplitude scaling exponent and 2) an entropy-like measure. We apply these measures to intraday, 30-second sampled prices of various stock market indices. Our results reveal intraday trends where different time-horizons contribute with variable relative amplitudes over the course of the trading day. Our findings indicate that the time series we analysed have a non-stationary multifractal nature with predominantly persistent behaviour at the middle of the trading session and anti-persistent behaviour at the opening and at the closing of the session. We demonstrate that these patterns are statistically significant, robust, reproducible and characteristic of each stock market. We argue that any modelling, analytics or trading strategy must take into account these non-stationary intraday scaling patterns.
© The Author(s) 2016
Open Access This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
