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Farish, Stephen J.

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Investigating Item Stability: An Empirical Investigation into the Variability of Item Statistics Under Conditions of Varying Sample Design and Sample Size. Occasional Paper No. 18.

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Farish, Stephen J. – 1984

The stability of Rasch test item difficulty parameters was investigated under varying conditions. Data were taken from a mathematics achievement test administered to over 2,000 Australian students. The experiments included: (1) relative stability of the Rasch, traditional, and z-item difficulty parameters using different sample sizes and designs;…

Descriptors: Achievement Tests, Difficulty Level, Estimation (Mathematics), Foreign Countries