engleski

The Rasch Model - Based Analysis of the Conceptual Survey of Electricity and Magnetism

The Conceptual Survey of Electricity and Magnetism (CSEM) is a well known assessment instrument designed to assess students' knowledge of electricity and magnetism, and diagnose difficulties that students have in this domain. CSEM was administered to a sample of Croatian students at University of Zagreb, and the data obtained were analyzed with the Rasch model. In the stochastic Rasch model the interaction of persons and test items is modelled as the probability of persons' success on an item, which depends only on item difficulty and person ability. The Rasch model enables calculation of linear measures for item difficulties and person abilities, which - together with the analysis of their fit to the model - provide important insight in the functioning of the test. The functioning of the CSEM is discussed on the basis of that analysis. The fit analysis revealed problematic functioning of some items (especially item 14), and the analysis of item difficulties suggested important differences in the difficulties of conceptual areas covered by CSEM.

Rasch model; electricity; magnetism

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