Sentence examples for items are stable from inspiring English sources
Although it is not reported here, a similar confirmatory model was estimated to assess the stability of the GAD-2 true score regardless of whether it was measured alone or in conjunction with the rest of the GAD-7 items, supporting the hypothesis that the items are stable in both situations (tau equivalent measures).
Both the factors, Factor 1 (Somatic symptoms) and Factor 2 (Mood-negative cognitions) had only 4 and 3 factors falling under them respectively and in the previous studies also it had been proposed that only a few factors and items are stable [ 27].
This indicated the 6 items were stable to form an index and had high internal reliability [ 32].
For each category of PTSD (probable cases, risk level cases and no cases), the mean levels of the WHOQOL-Bref subscales (the four domains and the two single items) were stable across time of assessment.
For each category of PTSD (probable cases, risk level cases and no cases), the mean levels of the WHOQOL-Bref subscales (the four domains and the two single items) were stable across time of assessment: for instance, the mean scores for the domain "psychological health" at T1 was 11.89, while the corresponding means at T2 and T3 were 12.14 and 11.54, respectively.
For Rasch analysis, data from 50 respondents allows 99% confidence that the item calibrations are stable within ± 1 logit [ 34].
The correlation of difficulties across the two occasions is good (mean = .704; range = .604 to.755) suggesting that item difficulties are stable across time.
They implicitly rely on the intuition that there are stable items with stable properties.
Consequently, the items measuring sleeping behaviour are stable to some extent.
The differential item functioning analysis results indicated that item calibrations were stable across different time periods for each of the four EORTC QLQ-PR25 domains.
