Numerical demodulation of a Gaussian white noise modulated in amplitude by a deterministic volatility

Abstract

The Gaussian white noise modulated in amplitude is defined as the product of a Gaussian white noise and a slowly varying signal with strictly positive values, called volatility. It is a special case of the superstatistical systems with the amplitude as the single parameter associated to the environment variations. If the volatility is deterministic, then the demodulation, i.e., the separation of the two components from a measured time series, can be achieved by a moving average with the averaging window length optimized by the condition that the absolute values of the estimated white noise are uncorrelated. Using Monte Carlo experiments we show that the large scale deterministic volatility can be accurately numerically determined. The artificial deterministic volatilities have a variety of shapes comparable with those occurring in real financial time series. Applied to the daily returns of the S&P500 index, the demodulation algorithm indicates that the most part of the financial volatility is deterministic.

Authors

Călin Vamoş

Maria Crăciun

Keywords

Statistical and Nonlinear Physics; computational methods; superstatistics; volatility; artificial time series; Monte Carlo methods

Paper coordinates

C. Vamoş, M. Crăciun, Numerical demodulation of a Gaussian white noise modulated in amplitude by a deterministic volatility, Eur. Phys. J. B (2013) 86: 166.
10.1140/epjb/e2013-31072-x

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Journal

The European Physical Journal B

Publisher Name

Springer-Verlag

Print ISSN

1434-6028

Online ISSN

1434-6036

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