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Psychometrically Relevant Differences between Source and Migrant Populations

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Patrick Brzoska

Psychometrically relevant population differences may limit the transferability of research instruments between migrants and their source population and may contribute to a low performance of quantitative questionnaires. Based on a review of existing taxonomies, this book develops a comprehensive analytical framework of equivalence that can serve multiple purposes. It allows to examine psychometrically relevant population differences, it can assist in the re-adaptation of questionnaires and it is a valuable tool for cross-group comparative research. The application of the framework is illustrated through the examination of equivalence of the Revised Illness Perception Questionnaire (IPQ-R) between chronically ill Turks residing in Turkey and Turkish migrants residing in Germany.
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6. Equivalence of the IPQ-R: Empirical results

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Kocaman et al. (2007) and Armay et al. (2007) translated the IPQ-R into Turkish and validated it by means of principal component analysis (see Section 2.3.3 for details). The structure of the Turkish version of the questionnaire has never been formally examined using a hypothesis-testing framework, which is the appropriate approach for a factor structure that is known a priori. Also, established baseline models are a prerequisite to examining the measurement equivalence of questionnaires across different populations along the proposed framework of questionnaire equivalence. Therefore, the construct and discriminant validity of the Turkish IPQ-R in Turks residing in Turkey and Turkish migrants residing in Germany have been examined as part of the present investigation (Research components 2a/b). The baseline model for Turks residing in Turkey has been published previously (Brzoska et al. 2012b) and will be presented in Section 6.1. Section 6.2 will illustrate the findings with respect to the equivalence of the IPQ-R (Research components 3a-d). The results will be presented along the methodical approach outlined in Chapter 5.

6.1 Establishment of the IPQ-R baseline models

6.1.1 Baseline model in Turks residing in Turkey

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