Given stationary time series data, we study the problem of finding the best linear combination of a set of lag window spectral density estimators with respect to the mean squared risk. We present an aggregation procedure and prove a sharp oracle inequality for its risk. We also provide...

This article examines the empirical determinants of import demand in oil exporting countries. We show by a panel cointegration analysis that the import demand in these countries depends positively on domestic demand and exports, the real exchange rate and oil prices. While the current account...

In March 1997, a FMD epidemic broke out in the Taiwan pig industry and within four months some 40 per cent of the pig population was lost to the disease. The demand for pork fell substantially following the outbreak due to food safety concerns by consumers, and this raises the question of...