Applying Item Response Theory in Language Test Item Bank by Gábor Szabó

By Gábor Szabó

Merchandise reaction conception, even though it has turn into a widely known device in language trying out study, continues to be no longer used usually in functional language overview tasks. This ebook intends to supply a theoretical evaluation in addition to to provide useful counsel about the program of IRT in merchandise financial institution development in a language checking out context by means of proposing a selected venture in a better schooling atmosphere.

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Extra info for Applying Item Response Theory in Language Test Item Bank Building (Language Testing and Evaluation)

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1991). Concerning their approach, each can be placed in one of six categories as defined by Hambleton et al. (1991:46). The first of these procedures is the so called joint maximum likelihood procedure (Lord 1980), which can be applied to all three of the major model types. Using this method it is possible to estimate ability and item parameters simultaneously.. The second method is the marginal maximum likelihood procedure (Bock and Aitkin 1981). Here first the ability parameter is integrated out, which makes it possible to estimate the item parameter(s).

00 in decimals) appears to be of little value in terms of measurement, as all candidates could answer it correctly. Similarly, an item with a facility value of 0 provides minimal information, namely that the item is definitely too difficult for this group (Alderson et al. 1995:81). In between, however, it is rather difficult to decide what figures are acceptable. g. Henning 1987; Hughes 1989; Alderson et al. 1995) tend not to identify strict limits. 67 are not acceptable owing to the scarcity of information they provide, there are several reasons why such items may not be refused.

Both the facility value and the discrimination index are sample dependent relative measures. g. Lord and Novick 1968), classical test theory and traditional item analysis cannot offer such parameters. The facility value, being the percentage of correct responses, obviously cannot be considered a constant measure of item difficulty, as the same item in a more able group will—by definition—yield lower figures. Similarly, since item discrimination—as has been demonstrated—is influenced by the facility value, as well as because it is computed on the basis of the performance of a particular population, the discrimination index is equally relativistic in nature.

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