Rasch model

in item response theory, a model in which only one parameter, item difficulty, is specified. This is thought to be a parsimonious way to describe the relation between an item response and an underlying dimension and is thus preferred in some cases. Also called one-parameter model. See two-parameter model; three-parameter model. [proposed in 1960 by Danish statistician Georg Rasch (1901–1980)]

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Psychology term of the day

December 7th 2024

adequate sample

a sample that sufficiently represents the larger population from which it was drawn in terms of size, being large enough to provide satisfactory precision by minimizing the possibility of chance affecting the data obtained.