Questionnaires are perhaps the most widely used measuring tools in nursing research as many studies conducted by nurses focus on understanding the underlying complex factors that are amenable to questionnaires. However, most questionnaires used for research purposes in nursing continue to display inadequate evidence of validity under the traditional methods while ignoring the modern Rasch techniques with better proofs of objective measurement. For questionnaire data to be powerful for statistical analysis, transparent demonstration of mathematical assumptions ratified in the questionnaire are compulsory. The failure to engage contemporary measurement models in designing good questionnaires raises concerns about researchers’ awareness of the application and usefulness of the evidence generated by the modern approach. The overall objective here is to draw researchers’ attention to the recurrent limitations of classical approach to questionnaire design and to suggest advanced psychometric analysis exemplified in Rasch methodology as a more appropriate alternative.
Therefore, this paper illustrates with examples the problems inherent in the traditional or classical test theory and advanced dimensionality and category functioning of a questionnaire as requisite psychometric properties of a questionnaire. In straightforward language, a unidimensional questionnaire evaluates a single research variable or construct per set of indicators or items on a questionnaire. Also, category functioning is an assumption test that examines the possibility that participants may fail to conserve the hierarchical order of the questionnaire categories in the way they have responded to the questions. Finally, a number of diagnostic parameters Rasch proponents recommended for testing the two essential validity criteria are outlined.
Original languageEnglish
JournalNurse researcher
Publication statusAccepted/In press - 21 Jul 2022


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