In: Computational Economics, 2012, vol. 39, no. 3, p. 315-335
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In: Annals of Finance, 2007, vol. 3, no. 2, p. 213-240
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In: Computational Management Science, 2005, vol. 2, no. 2, p. 87-106
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In: Statistics and Computing, 2010, vol. 20, no. 4, p. 421-434
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In: Computational statistics & data analysis, 2006, vol. 51, no. 4, p. 2267-2277
A multivariate methodology based on Functional Gradient Descent to estimate and forecast time-varying expected bond returns is presented and discussed. Backtesting this procedure on US monthly data, empirical evidence of its strong forecasting potential in terms of the accuracy of the predictions is collected. The proposed methodology clearly outperforms the classical univariate analysis used...
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In: Journal of forecasting, 2006, vol. 25, no. 8, p. 579–600
We propose a simple class of multivariate GARCH models, allowing for time-varying conditional correlations. Estimates for time-varying conditional correlations are constructed by means of a convex combination of averaged correlations (across all series) and dynamic realized (historical) correlations. Our model is very parsimonious. Estimation is computationally feasible in very large dimensions...
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In: Journal of business & economic statistics, 2011, vol. 29, no. 1, p. 138-149
We introduce a new multivariate GARCH model with multivariate thresholds in conditional correlations and develop a two-step estimation procedure that is feasible in large dimensional applications. Optimal threshold functions are estimated endogenously from the data, and the model conditional covariance matrix is ensured to be positive definite. We study the empirical performance of our model in...
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In: Computational management science, 2005, vol. 2, no. 2, p. 87-106
It is difficult to compute Value-at-Risk (VaR) using multivariate models able to take into account the dependence structure between large numbers of assets and being still computationally feasible. A possible procedure is based on functional gradient descent (FGD) estimation for the volatility matrix in connection with asset historical simulation. Backtest analysis on simulated and real data...
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In: Journal of financial econometrics, 2007, vol. 5, no. 4, p. 591–623
We propose a multivariate nonparametric technique for generating reliable shortterm historical yield curve scenarios and confidence intervals. The approach is based on a Functional Gradient Descent (FGD) estimation of the conditional mean vector and covariance matrix of a multivariate interest rate series. It is computationally feasible in large dimensions and it can account for non- linearities...
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Prices or returns of financial assets are most often collected in local times of the trading markets. The need to synchronize multivariate time series of financial prices or returns is motivated by the fact that information continues to flow for closed markets while others are still open. We propose here a synchronization technique which takes this into account. Besides the nice interpretation...
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