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The pattern of relative item difficulty for students from different schools is clearer in Fig. 2.
Specifically, the negative interaction between cognitive skill and item difficulty suggests that relative item difficulty helps determine disengagement.
A comparison between German and Austrian prospective teachers requires a similar level of relative item difficulty to ensure that the test measures the same latent trait.
Moreover, we assume that the positive effect of item difficulty on test-taking disengagement is weaker for more able test-takers because the relative item difficulty is lower for them.
The relative item parameter estimates (for each country, the mean value of the item parameter estimates is zero) are used to examine statistically significant differences as an indication for DIF.
The items in discussion task appeared more difficult for school A/B than they were for school C. In contrast, items in individual presentation task were easier for school A/B than they were for school C. Fig. 2 Relative item difficulty for the three schools.
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To reduce the complexity of the measurement model, the four sub-dimensions of learning motivation were treated as single indicators after parceling the relative items.
Moreover, an enhanced ability to switch between different perspectives to address moral dilemmas [54], [57] may explain why people with increased R precuneus volume tend to consider humanity as both good and bad and moral values relative (items loading on PC3, see Table 1).
Figure 3 shows how we selected participants for comparison of difficulty ratings of new floor and ceiling items relative to items in the PROMIS PF-10.
Relative difficulty (item difficulty) of each item was broad and ranged from a pass rate of 36% (item 15) to 84% (item 3).
Agreement was slightly higher for discontinuation items relative to continuation items and higher for items covering issues other than efficacy and safety, such as cost, insurance, and social support.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com