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For both methods, if several non-exposed subjects can be matched with an exposed one, the matched non-exposed subject is randomly chosen from the set of eligible subjects R m t ; if no non-exposed subjects are available, the exposed subject cannot be paired and is thus excluded from the analysis.
A pair composed of an exposed subject and a non-exposed one who would never undergo the exposure is called a "perfect pair", whereas it would be an "imperfect pair".
It is noted λ i t, Z i to specify that the estimation is made on the pair P j, which is composed of the exposed subject j and the non-exposed subject i matching on Z i.
λ i (t, Z i ) is the instantaneous risk function of event for the pair P j, which is composed of the exposed subject j and the non-exposed subject i matching on Z i.
Remove the exposed subject from the list of available exposed subjects.
Another alternative, whatever the model, would be to propose another non-exposed (perfect or imperfect) subject to the exposed subject of pair P j, who was now single in her pair.
Similar(20)
Therefore, a two-year incidence for hand-arm symptoms of 10% among low exposed subjects and 20% among high exposed subjects seems reasonable.
On average the aluminium exposed subjects had higher levels of aluminium in their hands than did the referent subjects.
Commonly, practitioners and clinicians alike are guided by the symptoms elaborated in putatively exposed subjects for the identification of high-risk patients.
WBV + RE exposed subjects to 5 one-minute bouts of vibration (20 Hz, 3.38 peak-peak displacement, separated by 1 min of rest) before RE.
She subliminally exposed subjects to crime-related objects, followed by a longer-lasting screen showing a black face and a white face.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com