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Psychometrically Relevant Differences between Source and Migrant Populations


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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Fig. 1: Population in Germany by migration background in 2011

Fig. 2: Rates of disability retirements by year (a) and age group (b; year 2007) stratified by nationality

Fig. 3: The self-regulatory model of illness

Fig. 4: Association of illness perceptions and attendance to cardiac rehabilitation programs

Fig. 5: Association of illness perceptions and adherence to long-term cardiac therapies

Fig. 6: Schematic overview of the research components of the present investigation

Fig. 7: The components of equivalence

Fig. 8: Hypothetical CFA measurement model with three factors (ξ1 to ξ3) and eight indicator variables (X1 to X8)

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