Parallel forms reliability (sometimes termed alternate forms reliability) is one of the three primary classifications of psychometric reliability, along with test-retest reliability and internal consistency reliability. The three categorizations of reliability differ primarily in the differing sources of non-trait or non-true score variability, and secondarily in the number of tests and occasions required for reliability estimation. This entry discusses the construction of parallel forms and the assessment, benefits, and costs of parallel forms reliability.
The creation of parallel forms begins with the generation of a large pool of items representing a single content domain or universe. At minimum, the size of this item pool should be more than twice the desired or planned size of a single test form, but the item ...
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