We assessed the seasonality of viral lower respiratory tract infections (V-LRI), bacteremic pneumonia, nonbacteremic pneumonia and nonpneumonia invasive pneumococcal diseases (IPD) in the pre-PCV era. Both bacteremic and nonbacteremic pneumonia seasonality peaked in winter, coinciding with V-LRI seasonality, whereas non-pneumonia IPD peaked in autumn before V-LRI increase, suggesting different ...

This paper examines the relationship between seasonality, idiosyncratic risk and mutual fund returns using multifactor models. We use a large sample containing the return histories of 728 UK mutual funds over a 23-year period to measure fund performance. We present evidence that idiosyncratic risk cannot be eliminated, we also find evidence of seasonality in all fund categories. Specifically, w...

conclusions due to seasonal variations in fruit and vegetable dietary intakes, the interventional and case-control studies should consider seasonality. educational and price controlling programs may control such observed seasonality in the intake of fruit and vegetables. results the highest consumption of vegetables was seen in summer (289 ± 3.4 g/day) while the lowest was in winter (224 ± 3.2 ...

The investigation of the seasonality of a disease is an important objective in many epidemiological studies. Two statistical methods (Edwards' and Walter-Elwood methods) are described here to detect cyclic trends in time of birth of children diagnosed with acute lymphoblastic leukaemia (ALL) aged 0 4 year . We found evidence of seasonality related to month of birth with peaks in February and Au...

Ecological networks exhibit non-random structural patterns, such as modularity and nestedness, which determine ecosystem stability with species diversity and connectance. Such structure-stability relationships are well known. However, another important perspective is less well understood: the relationship between the environment and structure. Inspired by theoretical studies that suggest that n...

Seasonal variation in the number of suicides has long been acknowledged. It has been suggested that this seasonality has declined in recent years, but studies have generally used statistical methods incapable of confirming this. We examined all suicides occurring in Norway during 1969-2007 (more than 20,000 suicides in total) to establish whether seasonality decreased over time. Fitting of addi...

Peaks in the spectrum of a stationary time series indicate the presence of periodic phenomena, such as seasonal and cyclical components. Extending the approach of McElroy and Holan (2009), this paper constructs nonparametric peak-estimators via windowing the periodogram with the same sinusoidal function used to define seasonal autocovariances. We also utilize a multiple testing procedure that c...