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ERIC Number: EJ1018747
Record Type: Journal
Publication Date: 2013
Pages: 24
Abstractor: As Provided
ISSN: ISSN-0211-2159
Measuring Anxiety in Visually-Impaired People: A Comparison between the Linear and the Nonlinear IRT Approaches
Ferrando, Pere J.; Pallero, Rafael; Anguiano-Carrasco, Cristina
Psicologica: International Journal of Methodology and Experimental Psychology, v34 n2 p383-406 2013
The present study has two main interests. First, some pending issues about the psychometric properties of the CTAC (an anxiety questionnaire for blind and visually-impaired people) are assessed using item response theory (IRT). Second, the linear model is compared to the graded response model (GRM) in terms of measurement precision, sensitivity to change, and person fit, and the results are also used to illustrate the functioning and advantages of IRT models. The participants were 670 blind or visually-impaired people from different Spanish cities. The results showed that the CTAC scores are accurate enough for practical purposes, and that respondents are quite consistent in their responses. Model-data fit was acceptable in both cases, and both models lead to similar results regarding the trait estimates, with the exception of extreme respondents who were better assessed with the linear model. The GRM assessed measurement precision better, and both models showed high sensitivity to change around cut-off values. Person-fit results were also similar in both models.
University of Valencia. Dept. Metodologia, Facultad de Psicologia, Avda. Blasco Ibanez 21, 46010 Valencia, Spain. Tel: +34-96-386-4100; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Spain
Grant or Contract Numbers: N/A