From Table 3, it is evident that most of the observed CEJ events are during Kp < 1 (13 events) and Kp < 2 (20 events), highlighting the variability in occurrence phenomena of CEJ during quiet days.
Variability in occurrence of CEJs could also be due to the differences in local wind shears that modify jet fields (especially during the noon hours), (Reddy and Devasia 1981) in addition to the observed changes in neutral winds (Sridharan et al. 2002; Vineeth et al. 2007).
The model was highly accurate, and explained 95% of the variability in occurrence (98% of the absences and 95% of the presences).
Although these exacerbations are often caused by bacterial or viral infections [ 2] or inhaled particles, the variability in occurrence within COPD patients and the familial aggregation of exacerbations indicate that other factors such as genetics are important in determining the onset, severity and frequency [ 3].
In Denmark, Vigre et al [ 14] reported the existence of two large spatial clusters of positive herds during an initial 2-y period of disease occurrence, and although geographical variability in the occurrence of disease existed, directionality was not apparent from the results, nor was it discussed.
The rationale for including year of birth as an independent variable was that there was variability in the occurrence of obstetric and neonatal diagnoses during the observation period.
The wide variability in BPD occurrence across hospitals could offer insights into potential risk or preventive factors.
This paper investigates variability in the occurrence of different event sequences on an annual basis during the operation of a proposed nuclear facility.
Spatio-temporal variability in graffiti occurrence across inner-city Sydney highlights the need to consider graffiti as a diverse urban phenomenon when attempting to understand its occurrence and formulate response strategies.
This reductionist approach has generated many discoveries, but misses important interactive and cumulative effects that may help explain the broad range of variability in disease occurrence observed across studies and individuals.
The seasonal as well as the day-to-day variability in the occurrence of F0.5 layer as mentioned in this paper seems to be a result of the variations in the amplitude and phases of the tides and gravity waves, and inventory of the metallic ions of meteoric origin.
