Temporal aggregation is known to affect the persistence of time series. We study the aggregation of flow variables as … clarified when persistence is increased or decreased, and by how much. Our results are exact for a finite aggregation level …. They are illustrated with monthly time series. Approximate results for the growing aggregation level are provided, too. …

The effects of systematic sampling and temporal aggregation on the seasonal cycle model (see Miron, 1993) and the … seasonally integrated process (see Hylleberg et al., 1990) are discussed. The temporal aggregation theory is used to improve the …