This study examines the random walk hypothesis for the crude oil markets, using daily data over the period 1982-2008. The weak-form efficient market hypothesis for two crude oil markets (UK Brent and US West Texas Intermediate) is tested with non-parametric variance ratio tests developed by...

Dans cet article, nous proposons de poursuivre les investigations en matière de parité des pouvoirs d’achat dans le cadre de l’économie chinoise en employant une procédure en deux étapes basée sur des tests de racine unitaire et prenant en compte la présence de points atypiques dans...

In this paper we re-examine whether purchasing power parity holds in the long run in China from a two-steps procedure correcting outliers and testing unit roots. Thus, the efficient unit root tests developed by Elliott, Rothenberg and Stock (1996) and Ng and Perron (2001) are applied on the...

Dans cet article nous étudions la présence de chocs temporaires et permanents, peu fréquents, dans les séries trimestrielles du PIB de l’après seconde guerre mondiale en France, au Royaume-Uni et aux Etats-Unis à partir de l’approche des points atypiques. Nous trouvons que des...

Using the outliers methodology, the focus of this paper is to present the time series dynamics of the German higher education system before 1945. The outline of the paper is as follows. In Section 2, we define the outliers and describe the outliers identification procedure. We apply this...

In this paper, we study the nature of the trend (deterministic or stochastic) for long spans of US GNP data (1869-1993). This distinction is important for macroeconomic theories, because the two models imply very different source of output fluctuations due to (transitory or permanent) shocks. We...

In this paper we examine whether purchasing power parity holds in the long run in China for the period 1970:1 to 2006:5 from an alternative method relative to the previous studies. We underlined the effects of large, but infrequent shocks due to changes of Chinese exchange policy (undertaken...

Monte Carlo simulations are used to study the size and power properties of two stationarity tests developed by Kwiatkowski et al. (1992) [KPSS] and Leybourne and McCabe (1994) [LMC] when the data contain additive outliers. We show that the KPSS tests are very robust to additive outliers whereas...

In this paper we propose an extension of the maximum likelihood seasonal cointegration procedure developed by Lee (1992) for daily time series. We compute the finite sample critical values of the associated test statistics in daily seasonal time series.