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Exact(16)
After reading a general overview of the task, each participant completed two blocks of items.
Stage 1 included only four blocks of items that broadly covered the range of item difficulty as this initial routing decision was based on limited information.
The methods that help to ensure the comparability of the scales of future assessments typically utilize common blocks of items over time.
For the Wave I testing, because of the large number of PROMIS items, a complex sampling approach was used where participants were randomly assigned to either respond to two full-item banks or to multiple 7-item blocks of items.
Among the five blocks of items, two of them served as routing blocks at the first stage (Router 1 and Router 2), and the other three were used at the second stage with items of high (Hard block), medium (Medium block), and low difficulties (Easy block).
Data were acquired in two different runs, each with 32 blocks of items.
Similar(42)
The increased amount of available information made more precise assignments possible in Stage 2, where each block of items covered a narrower range of the difficulty spectrum.
If we contrast this block of items with the opinion of the teachers, we can see that the results coincide, although the students tend to evaluate all the aspects at a higher level.
A third, vertical block of items contains the item responses for both diagnoses together, thus providing linkage in the dataset.
For the remaining items, factor analyses with principal components analysis and varimax or oblique rotation per block of items, were performed to extract factors for each theoretical concept.
Each condition was presented 3 times in a pseudorandom order in blocks of 14 items; each item lasted 2 s, and was preceded by a 3-s written instruction on the screen.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com