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Erschienen in: Review of Quantitative Finance and Accounting 4/2009

01.11.2009 | Original Research

Forecasting time-varying covariance with a range-based dynamic conditional correlation model

Erschienen in: Review of Quantitative Finance and Accounting | Ausgabe 4/2009

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Abstract

This paper proposes a range-based dynamic conditional correlation (DCC) model combined by the return-based DCC model and the conditional autoregressive range (CARR) model. The substantial gain in efficiency of volatility estimation can boost the accuracy for estimating time-varying covariances. As to the empirical study, we use the S&P 500 stock index and the 10-year treasury bond futures to examine both in-sample and out-of-sample results for six models, including MA100, EWMA, CCC, BEKK, return-based DCC, and range-based DCC. Of all the models considered, the range-based DCC model is largely supported in estimating and forecasting the covariance matrices.

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Fußnoten
1
The k-dimensional VECH model is written as \( {\text{vech}}\left({H_{t}} \right) = A + B\,{\text{vech}}\left({\xi_{t - 1} \xi_{t - 1}^{'}} \right) + C\,{\text{vech}}\left({H_{t - 1}} \right) \), where H t is the conditional covariance matrix at time t and vech(H t ) is the vector that stacks all the elements of the covariance matrix.
 
2
It is a general parameterization that involves the minimum number of parameters while imposing no cross equation restrictions and ensuring positive definiteness for any parameter value.
 
3
Other econometric methods for estimating the time-varying correlation are proposed by Tsay (2002) and by Tse and Tsui (2002).
 
4
Shu and Zhang (2006) provide relative performance of different range-based volatility estimators, and find that the range estimators all perform very well when an asset price follows a continuous geometric Brownian motion.
 
5
Fernandes et al. (2005) utilize the formula Cov(X,Y) = [V(X + Y) − V(X) − V(Y)]/2 to propose a kind of multivariate CARR model. However, this method limits the multivariate CARR model to a bivariate case only.
 
6
The MEM model is designed to fit a non-negative series, like duration or realized volatility.
 
7
The RiskMetrics database uses the exponentially-weighted moving average model with λ = 0.94 for updating daily volatility estimates. J.P. Morgan found that, across variant market variables, this value of λ results in forecasts of the volatility that come closest to the realized volatility. Following J.P. Morgan’s suggestion, the variable λ equals 0.94 for the time being in the later empirical discussion.
 
8
The estimate of λ is 0.94 approximately for the returns that we adopted in this study.
 
9
It is also intuitively clear that the out-of-sample forecasts for the covariance are all constant in the EWMA model.
 
10
The coffee data is obtained from Datastream.
 
11
Naïve here is the short hedge with selling one unit futures.
 
Literatur
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Metadaten
Titel
Forecasting time-varying covariance with a range-based dynamic conditional correlation model
Publikationsdatum
01.11.2009
Erschienen in
Review of Quantitative Finance and Accounting / Ausgabe 4/2009
Print ISSN: 0924-865X
Elektronische ISSN: 1573-7179
DOI
https://doi.org/10.1007/s11156-009-0113-3

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