Talk presented at the conference “New Trends on Intelligent Systems and Soft Computing 2014”, University of Granada, Spain. 13-14 February 2014.Abstract Many applications require a large number of time series to be forecast completely automatically. For example, manufacturing companies often require weekly forecasts of demand for thousands of products at dozens of locations in order to plan distribution and maintain suitable inventory stocks. In these circumstances, it is not feasible for time series models to be developed for each series by an experienced …