7. What can we learn from the findings?
The overall aim of the present investigation was to examine psychometrically relevant differences between source and migrant populations using the assessment of illness perceptions in chronically ill Turks residing in Turkey and Turkish migrants residing in Germany as an example. The research question was studied by means of a mixed-method design implemented through one methodical and two empirical components. This chapter provides a discussion of the findings along the three research components. In light of previous literature, it discusses the analytical framework of questionnaire equivalence, the factor structure of the IPQ-R for Turks residing in Turkey and Turkish migrants residing in Germany as well as its equivalence between both populations. Finally strengths and weaknesses of the examination are discussed.
The analytical framework of questionnaire equivalence
The proposed analytical framework of questionnaire equivalence can be considered an integration of existing taxonomies for the study of different types of equivalence in (cross-group) survey research. The framework extends the classical “quantitative” hierarchical assessment procedure for measurement invariance that goes back to work by Jöreskog (1971) and others by qualitative components of equivalence proposed by Herdman et al. (1998). In doing so, it provides a more comprehensive picture of equivalence and, in the present case, helped to identify reasons for measurement non-invariance that could not have been revealed if only a (quantitative) assessment of measurement invariance was conducted.
The measurement equivalence component of the framework differs from previous suggestions in several ways. For reasons outlined...
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