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The fit to the Rasch model guarantees some methodological advantages [ 37, 41]: The FPQ person parameters are interval scale measures, person parameters can (as in adaptive testing) also be derived from a portion of the scale items, and the person fit can be analyzed so that inattentive responders or cognitively-challenged patients can be identified.
First, we calculated inter-test intervals among patients whose previous test(s) was/were non-reactive or who had only non-acute reactive tests for a period of at least two years; tests for differences in inter-test intervals were carried out using linear regression with GEE to account for repeated measures person among those who tested three or more times.
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The process of measuring person estimations on the same scale is called equating.
English proficiency certificates have two meanings: they measure language talent, and they also measure person's self-discipline and their capacity for self-development.
The map of persons and items is useful for comparing the range and position of the items and can be also utilized to measure person's distributions.
On average 9% of the records had missing data on the outcome measure (person catching the baby) and these records have been removed from the analyses.
We measured person years from baseline (2004 08) until the date of death, loss to follow-up, or 31 December 2013, whichever occurred first.
Both item measure and person measures were expressed in log-odds units, or logits, along the same scale.
Like many other population-based air pollution studies, we did not measure person-level pollution exposure.
Only mouth inhalation was measured, persons were wearing a nose clip to prevent nose respiration.
With reliability analysis the scale measuring persons' ability to adapt showed good internal consistency, Cronbach's alpha =.80.
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