Using the Rasch rating scale model to calibrate the Body Self-Image Questionnaire
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초록
The purposes of this study were a) to calibrate the Body Self-Image Questionnaire (BSIQ), b) to investigate the response category function, c) to construct the questionnaire with items showing acceptable fit statistics, d) to validate the model using a smaller sample, and e) to describe item difficulty and person ability on the same continuum using the Rasch rating scale model. The data for this study were obtained from 1,021 undergraduate students using the BSIQ made up of 39 items under the nine factors related to the body image construct and a Likert 5-point scale. The data from each subscale were initially calibrated for investigating category function and item structure. Violations in category function were found from the initial calibrations for the fatness evaluation (FE), social dependence (SD), height dissatisfaction (HD), and investment to ideals (II) subscales. The collapsed 4-point categorization obtained by combining categories three and four functioned better than other combinations for the FE, SD, HD, and II subscales and the original categorization was retained for the other subscales. Three misfitting items were also identified and deleted from corresponding subscales for further analysis. The revised categorization and item structure were validated using a validation sample (n = 510) randomly selected from the total sample. Similar patterns of categorization were observed and confirmed. Hierarchical orders of item difficulties for the validation sample were identical to the total sample. To provide an evidence of construct validity, three groups were formed based on BMI scores and the means in logits for the three BMI groups were compared and contrasted. Overall discrimination among groups for each subscale was effective. The findings from these analyses supported that the data fitted the rating scale model well and the rating scale model adequately contrasted items and respondents according to their measures in logits.
Abstract
The purposes of this study were a) to calibrate the Body Self-Image Questionnaire (BSIQ), b) to investigate the response category function, c) to construct the questionnaire with items showing acceptable fit statistics, d) to validate the model using a smaller sample, and e) to describe item difficulty and person ability on the same continuum using the Rasch rating scale model. The data for this study were obtained from 1,021 undergraduate students using the BSIQ made up of 39 items under the nine factors related to the body image construct and a Likert 5-point scale. The data from each subscale were initially calibrated for investigating category function and item structure. Violations in category function were found from the initial calibrations for the fatness evaluation (FE), social dependence (SD), height dissatisfaction (HD), and investment to ideals (II) subscales. The collapsed 4-point categorization obtained by combining categories three and four functioned better than other combinations for the FE, SD, HD, and II subscales and the original categorization was retained for the other subscales. Three misfitting items were also identified and deleted from corresponding subscales for further analysis. The revised categorization and item structure were validated using a validation sample (n = 510) randomly selected from the total sample. Similar patterns of categorization were observed and confirmed. Hierarchical orders of item difficulties for the validation sample were identical to the total sample. To provide an evidence of construct validity, three groups were formed based on BMI scores and the means in logits for the three BMI groups were compared and contrasted. Overall discrimination among groups for each subscale was effective. The findings from these analyses supported that the data fitted the rating scale model well and the rating scale model adequately contrasted items and respondents according to their measures in logits.
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