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Download full textWainer, Howard; And Others – 1991
It is sometimes sensible to think of the fundamental unit of test construction as being larger than an individual item. This unit, dubbed the testlet, must pass muster in the same way that items do. One criterion of a good item is the absence of differential item functioning (DIF). The item must function in the same way as all important…
Descriptors: Definitions, Identification, Item Bias, Item Response Theory
