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While most subscales were at least adequately informative, the Awe subscale had a low information function for all levels of the Awe latent trait and may benefit either from inclusion of an additional item, or from rewriting.
The information function for the test reaches its maximum for persons with an approximately average competence level.
First, the Test Information Function (TIF) was calculated based on the sum of the information function for each item.
To our knowledge, this is the first study reporting the test information function for ODI.
The Awe subscale had a low information function for all levels of the Awe latent trait and may benefit from inclusion of an additional item.
Figure 14 shows the average item information function for the General Psychopathology subscale as a function of the total subscale score.
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To explore the inflated Type I error rates of the item-fit residuals, Fig. 2 shows the Type I error rates as a function of (theta) and the test information functions for the four NAEP data sets.
Figure 4 shows the total information functions for females and males.
To this end, we generated item information functions for each indicator, and selected indicators that maximized information around the median underlying latent trait level for persons with each CAM feature positive.
Figure 1 displays six test information function curves for the 47 items from the six subscales.
The item information function allows for the reliability of a measure to be explored throughout the entire underlying construct.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com