Modeling market impact and timing risk in volume time

Slava Mazur ()
Additional contact information
Slava Mazur: Quantitative Strategist at Liquidnet, Postal: Liquidnet, 498 Seventh Avenue, New York, NY, 10018, USA, phone: +16466608021

Algorithmic Finance, 2013, vol. 2, issue 2, 113-126

Abstract: Intraday volatility and market impact models in volume time are proposed. We build an intraday volatility profile to capture non-stationarity of intraday price returns and utilize a fractional Brownian motion process to measure deviations from square root scaling rule of volatility.

We propose a generalized, scalable market impact model that encompasses two mainstream approaches: an aggregated impact of a series of trades on a sufficiently long trading horizon and a transient impact of individual trades.

We give an intuitive interpretation of the model parameters and provide a generalized formulation of the optimal trading horizon and efficient trading frontier.

The self-similarity feature of an aggregated model allows for its application to smaller trading horizons and modeling of transient impact of sliced orders. We formulate conditions when the impact of sliced orders can be consistently aggregated to the total impact of the original order and deduce relationships between parameters of macro and micro level models to enforce such consistency.

We demonstrate that the parameters of aggregated and transient impact models are intimately related to the auto-covariance function of trade signs. We give an explicit formulation of such a relationship when the stated auto-covariance function has a power law form.

Keywords: Intraday Volatility; Fractional Brownian Motion; Hurst Index; Market Impact; Efficient Trading Frontier; Transient Impact; Decay Kernel (search for similar items in EconPapers)
JEL-codes: C00 E00 (search for similar items in EconPapers)
Date: 2013
References: Add references at CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:ris:iosalg:0018

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