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The stability of the items over time was evaluated by examining each item for DIF by administration.
The Spearman-Brown coefficient and Guttman split-half coefficients were also fair and acceptable for stability of the items with a value of 0.61.
Again, we selected items from the SMFQ a priori based on criteria necessary to establish a depression diagnosis and other research suggesting the stability of the items in depressed youth throughout childhood [ 30, 31].
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There is a paucity of studies that explore the stability of the item hierarchy in the WSAS across different disease populations.
In addition, the stability of the item logit locations was assessed over time.
We performed Rasch analyses in both cohorts to study the stability of the item logits and item order across the different samples.
Although these preliminary results suggest the adequacy of the new instrument, further research will be necessary to confirm the validity, reliability and stability of the item calibrations found for the NHP22.
Although the original FSS has been used to measure fatigue in a variety of different populations, we found no studies that explored the stability of the item hierarchy across different disease populations.
All levels of reliability were shown superior to 0.85 except for "Coping", which had a poor reliability displaying a value of 0.218.These values demonstrated the high stability of all the items in the Spanish OMPQ.
To evaluate the stability of the common items' difficulty between adjacent grades, displacement measures should be estimated for each anchor item to check discrepancies between the anchor value and the parameter that would have been estimated for the target test form if this parameter was unanchored (Linacre, 2011).
The consistency and the stability of the questionnaire items were measured through Cronbach's α coefficient.
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