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ERIC Number: EJ1177896
Record Type: Journal
Publication Date: 2013
Pages: 13
Abstractor: As Provided
ISSN: ISSN-1029-8457
The Usefulness of the Rasch Model for the Refinement of Likert Scale Questionnaires
Retief, Liezel; Potgieter, Marietjie; Lutz, Marietjie
African Journal of Research in Mathematics, Science and Technology Education, v17 n1-2 p126-138 2013
In this paper the use of the Rasch model is explored as a transparent, systematic and theoretically underpinned response to quality issues that are widely recognised as problematic in the refinement of Likert scale questionnaires. Key issues are the choice of length of scale, the pursuit of a favourable estimate of Cronbach's alpha at the possible expense of construct validity, and the fact that total raw scores arise from ordinal data but are used and interpreted as if measurement had occurred. We use a questionnaire under development for the measurement of perceptions of first-year chemistry students on demonstrator effectiveness to illustrate the process of Rasch analysis and instrument refinement. This process involves investigation of fit of the data to the model, possible violations of the assumption of local independence, and several aspects of item functioning. We identified disordered response categories as the probable reason for misfit in this data set and propose strategies for modification of items so that they can be retained rather than rejected.
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Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: South Africa
Grant or Contract Numbers: N/A