Ever since the appearance of the ARCH model [Engle(1982a)], an impressive array of variance specifications belonging to the same class of models has emerged [i.e. Bollerslev's (1986) GARCH; Nelson's (1990) EGARCH]. This recent domain has achieved very successful developments. Nevertheless,...

We propose a model to estimate the price volatility in of the Mexican Export Crude Oil Blend. The analysis relies on the conditional standard deviations obtained from a GARCH model. Data includes diary oil prices between January 2nd, 1998 and February 14th, 2007. The chosen model is of the GARCH...

This paper shows firstly that the money-in-the-utility-function model presents exactly the same kind of limitations as the cash-in-advance model for characterizing explosive hyperinflation. These limitations relate to sufficient money essentiality in the sense of Scheinkman (1980). Thereby, this...

This discussion paper resulted in an article in the <I>Journal of the American Statistical Association</I> (2007). Vol. 102, issue 477, pages 16-27.<p> Novel periodic extensions of dynamic long memory regression models with autoregressive conditional heteroskedastic errors are considered for the analysis...</p></i>

This discussion paper led to a publication in the <I>Electronic Journal of Statistics</I> (2014). Vol. 8, pages 1088-1112.<P> We characterize the dynamic properties of Generalized Autoregressive Score (GAS) processes by identifying regions of the parameter space that imply stationarity and ergodicity. We...</p></i>

Although the main interest in the modelling of electricity prices is often on volatility aspects, we argue that stochastic heteroskedastic behaviour in prices can only be modelled correctly when the conditional mean of the time series is properly modelled. In this paper we consider different...

See the publication in the <I>Journal of Risk and Financial Management</I> (2012). Volume 5(1), pages 78-114.<P> The main purpose of this paper is to evaluate the effect of crude oil price on global fertilizer prices in both the mean and volatility. The endogenous structural breakpoint unit root test,...</p></i>

The Central Bank of the Republic of Turkey has started to implement its new policy mix since late 2010. In this new approach expectations, credit growth and reel exchange rate are monitored closely as key indicators for financial stability on top of price stability. The effect of this new...

As far as the author’s knowledge, the paper is the first attempt dedicated to understanding the risk and volatility of constituents of the young and rapidly growing Islamic mutual funds’ industry. The novelty of our approach lies in the usage of wavelet tools to high-frequency financial...

For a few years the revenue services of the DGDA have increased in a spectacular way in Democratic Republic of Congo. Thus, the objective of this paper is to empirically examine the evolution of these monthly receipts of 1982 to 2005. The Heteroskedastic Conditional Autoregressive model (ARCH)...