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Linking PISA 2000 and PISA 2009: Implications of instrument design on measurement invariance

Author(s): Eunike Wetzel | Claus H. Carstensen

Journal: Psychological Test and Assessment Modeling
ISSN 2190-0493

Volume: 55;
Issue: 2;
Start page: 181;
Date: 2013;
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Keywords: PISA | measurement invariance | linking | link error | position effects

An important pre-requisite of trend analyses in large scale educational assessments is the measurement invariance of the testing instruments across cycles. This paper investigates the measurement invariance of the PISA 2000 and PISA 2009 reading instruments using Item Response Theory models. Links between the PISA 2000 and PISA 2009 instruments were analyzed using data from a sample tested in 2009 which took both the PISA 2000 and PISA 2009 instruments and additionally using part of the German PISA 2000 sample. Model fit comparisons showed that the instruments are not measurement invariant and that some link items show large differences in item difficulty. Position effects may explain some of these differences and may also influence the size of the link error.
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