Astolfi, Roberto; Ladiray, Dominique; Mazzi, Gian Luigi - In: Vierteljahrshefte zur Wirtschaftsforschung 70 (2001) 3, pp. 377-398
Most of the Euro-zone economic short-term indicators are computed through aggregation from Member States data. The seasonally adjusted figures can be calculated by seasonally adjusting the aggregate (direct approach) or aggregating the seasonally adjusted national data (indirect approach)....
