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the main objective in sampling is to select a sample from a population in order to estimate some unknown population parameter, usually a total or a mean of some interesting variable. a simple way to take a sample of size n is to let all the possible samples have the same probability of being selected. this is called simple random sampling and then all units have the same probability of being ch...
chapter one is devotod to collect some notion and background informations, which are needed in the next chapters. it also contains some important statements which will be proved in a more general context later in this thesis. in chapter two, we show that if the marginal factor-group is of order np1...pk,n>1, then we obtain a bound for the order of the verbal subgroup. also a bound for the bear-...
IMPORTANCE Although there is a growing recognition that older adults and those with extensive comorbid conditions undergo cancer screening too frequently, there is little information about patients' perceptions regarding cessation of cancer screening. Information on older adults' views of screening cessation would be helpful both for clinicians and for those designing interventions to reduce ov...
Brugada syndrome (BrS) has been named after the description of the disease made by the Brugada brothers in 1992. BrS is clinically characterized by arrhythmic events, in particular ventricular fibrillation, resulting in syncope and sudden cardiac arrest mainly in middle-aged men. The ECG shows a peculiar down-sloping elevation of the ST segment in the right pre-cordial ECG leads with inversion ...
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