Article,

NEPS Technical Report for Physics Competence: Scaling Results for the Additional Study Baden-Wuerttemberg

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NEPS Survey Paper, (2016)

Abstract

The National Educational Panel Study (NEPS) is aimed at investigating the development of competences across the entire life span. It also develops tests for assessing different competence domains. In order to evaluate the quality of these competence tests, a wide range of item response theory (IRT) analyses were carried out. This paper describes the data and results of analyses of the physics competence test that was used in the additional study Baden-Wuerttemberg. It is based on a subset of items from a test which was administered in the additional study Thuringia. In sum, 4,875 students took the test in these three waves. The physics competence test consisted of 41 items. A Rasch model was used to scale the data. Item fit statistics and differential item functioning were investigated. The results showed that the items exhibited good item fit and measurement invariance across various groups. The paper also provides some information about the data available in the Scientific Use File, Con-Quest- and TAM-syntaxes for scaling the data, and appendices that describe the scaling of each wave separately.

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