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The Implications Of Halo Effects And Item Dependencies For Objective Measurement, T Mcnamara, Ray Adams
The Implications Of Halo Effects And Item Dependencies For Objective Measurement, T Mcnamara, Ray Adams
Prof Ray Adams
Analysis of data from performance-based language tests presents the problem of dealing appropriately with bundles of items that are linked to particular tasks. The authors use recent developments in Rasch modelling which allow analysis of bundles of items (or sets of ratings) to examine the extent of dependence between items and ratings, and they explore the implications of those dependences on the assessments. Data from two performance assessments are used in two studies of this problem.