The phrase "variation in occurrences" is grammatically correct and can be used in written English.
It refers to differences or changes in how often something happens. Example: "There was a noticeable variation in occurrences of mild weather this year compared to the previous year's harsh winter."
In addition, considering the data size (14 periods) and the degree variation in occurrences (( theta = 0.2592 )) the GFMAPR forecasts evaluated in terms of the MAPE can be considered satisfactory since it was found to lay within an expected range of ( bar{F} pm 1sigma_{F} (4 le k le 15 ,0.2 le theta le 0.3) ) (See Table 20).
15 Few studies exist on seasonal variation in occurrences of stroke and death risk after stroke in patients with AF.
Such factors may be climate factors, for example, temperature, humidity and hours of sunshine, as well as seasonal variation in occurrences of risk factors for both AF and stroke, for example, hypertension 27 28 and infectious diseases.
Moreover, from a nocturnal variation in occurrence of scintillation with (S4 ⩾ 0.2) and enhancement of ROTI with (ROTI ⩾ 0.5), a general trend of higher occurrence in pre-midnight hours of equinox and winter seasons is observed in both indices during the year 2011 and 2010, while no significant trend is observed in the year 2009.
The remaining 22 behaviors showed cross-site variation in occurrence ranging from absent through to customary, representing to our knowledge, the first documented cases of traditions in this taxon and only the second case of multiple traditions in a New World monkey species.
A further study found marked seasonal variation in occurrence, with a June peak (28).
Although some studies report that its incidence has been stable, others report changes in incidence over time and geographic variation in occurrence [ 2, 3].
The right hand panel, which shows daily counts for a single month demonstrates more clearly the day to day variation in occurrence of LRI episodes.
The final multiple regression model containing age, morning drinking and domestic violence explained 15% of the variation in occurrence or non-occurrence of MDD (pseudo R = 14.87, P < 0.0001).
A striking feature of breast cancer epidemiology is its geographic variation in occurrence, with differences in invasive breast cancer incidence as high as 10-fold internationally [ 1] and two-fold among counties within the US [ 2].
Table 2 illustrates the results of a participatory voting exercise (N = 23 participants) where each participant was given 8 beans to distribute among the four zones according to the perceived geographic variation in occurrence of the condition in question.
