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For many large scale tests, Item Response Theory (IRT) now provides a satisfactory methodological alternative to CTT.
Out of the 14 items, 7 of them were highlighted by only one of the hypothesis tests (items 2, 20, 30, 32, 34, 35, 48), six items by two of the tests (17, 23, 29, 41, 49) and one item by all three of the hypothesis tests (item 5).
The delay between the reference and index tests (item 3) was specified as less than 4 weeks in only three of the studies.
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This consideration should be kept in mind by researchers when constructing low-stakes tests items.
Students, teachers, and schools are all evaluated solely on these tests items.
But some read the test item as the token of a wider malaise.
A test item may stimulate daydreams not suggested by items in similar tests, or by the same test on a different day.
Support for the test item design process, based on divergent and convergent production, could lead to better test items.
Unlike in traditional measurement methods, in binary testing each test item provides only one bit of information.
The test items that fall between the two vertical dotted lines (thresholds.77 to 1.30) are considered acceptable; test items to the left overfit (see test item 34), indicating duplication or having limited contribution.
Initial test item percent difficulty range was 15.2%-98.1%; discrimination values range, 0.03-0.50; final test item percent difficulty range, 17.6%-91.1%, discrimination values range, –0.04 to 1.04.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com