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Item Discrimination: When More Is Worse, Geoff Masters
Item Discrimination: When More Is Worse, Geoff Masters
Prof Geoff Masters AO
High item discrimination can be a symptom of a special kind of measurement disturbance introduced by an item that gives persons of high ability a special advantage over and above their higher abilities. This type of disturbance, which can be interpreted as a form of item bias, can be encouraged by methods that routinely interpret highly discriminating items as the best items on a test and may be compounded by procedures that weight items by their discrimination. The type of measurement disturbance described and illustrated in this paper occurs when an item is sensitive to individual differences on a second, …
Common Person Equating With The Rasch Model, Geoff Masters
Common Person Equating With The Rasch Model, Geoff Masters
Prof Geoff Masters AO
Two procedures, one based on item difficulties, the other based on person abilities, were used to equate 14 forms of a reading comprehension test using the Rasch model. These forms had no items in common. For practical purposes, the two procedures produced equivalent results. An advantage of common person equating for testing the unidimensionality assumption is pointed out, and the need for caution in interpreting tests of common item invariance is stressed.
Constructing An Item Bank Using Partial Credit Scoring, Geoff Masters
Constructing An Item Bank Using Partial Credit Scoring, Geoff Masters
Prof Geoff Masters AO
A method for banking test items scored in several ordered response categories is described. Each item is seen as an ordered sequence of steps, and test forms are equated using the estimated difficulties of the steps in their shared items. Procedures for analyzing the internal consistency of individual links and for analyzing the coherence of an entire linking structure are described. The methodology is used to link six forms of a mathematics problem solving test.
Defining A 'Fear-Of-Crime' Variable: A Comparison Of Two Rasch Models, Geoff Masters
Defining A 'Fear-Of-Crime' Variable: A Comparison Of Two Rasch Models, Geoff Masters
Prof Geoff Masters AO
No abstract provided.