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Table 5 shows the estimated item positions effects from M4.
There was no correlation between item positions and the latent trait because item positions were randomly determined independent of the latent trait.
The cumulated class probabilities across item positions for both models are displayed in Fig. 2.
Fig. 2 Cumulated decline class probabilities across item positions for multi-class mixture PD models.
If item positions are randomly determined for each examinee (i.e., independent of examinees' latent trait levels), then the correlation between item positions and the latent trait can be excluded from the model for the sake of model parsimony.
However, changing item positions can also result in changes in item difficulty as a result of the interaction of item positions and the latent trait (e.g., Debeer and Janssen 2013; Weirich et al. 2014).
Similar(38)
Test form, passage position, and item position effects were investigated.
The right side of each Wright map displays item measures and item position.
We first correlated item RTF with item position in each block.
The results indicated that 23 out of the 45 items showed significant item position effects.
Figure 8 shows the item RTF, arranged by item position in each block.
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