The unit root test with structural break developed by Perron and Rodriguez are used to study the purchasing power parity (PPP) in the spirit of Balassa-Samuelson in Australia for the period January 1977 to April 2004. The results indicate that there is a break in February 1985 which coincides...

In this paper, we examine the large shocks due to major economic or financial events that affected U.S. macroeconomic time series on the period 1860-1988, using outlier methodology. We show that most of these shocks have a temporary effect, showing that the U.S. macroeconomic time series...

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...

This paper reviews the recent developments in the field of the variance-ratio (VR) tests of the random walk and martingale hypothesis. In particular, we present the conventional individual and multiple VR tests as well as their improved modifications based on power-transformed statistics, rank...

This study examines the random walk hypothesis for the Shanghai and Shenzhen stock markets for both A and B shares, using daily data over the period 1992-2007. The hypothesis is tested with new multiple variance ratio tests - Whang-Kim subsampling and Kim's wild bootstrap tests - as well as the...

In this paper we investigate the effect of the outliers on the decomposition of Nelson-Plosser macroeconomic data set into permanent and transitory components from structural time series models. We show that the outliers can disturb the unobserved-components decomposition, especially the...

We study the performance of several short-term trend estimators for current economic analysis. These estimators are available in X11-ARIMA, X12-ARIMA, TRAMO-SEATS and STAMP. We also include two other trend-cycle estimators obtained by post-processing seasonally adjusted data with X11ARIMA,...

This study examines the random walk behavior of major Euro exchange rates. The hypothesis is tested with new variance ratio tests based on power transformation and multiple ranks from daily and weekly data. We find that Euro exchange rates for the major trading countries follow the random walk...