Graded response modeling of the Quality of Life Interview

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Abstract

A graded response model [Samejima, 1969. Psychometrika Monograph Supplement, 17; Samejima, 1972. Psychometrika Monograph Supplement, 18; Samejima, 1997. Handbook of Modern Item Reponse Theory (pp. 85-100). New York: Springer Verlag] was outlined and applied to an aggregated data set (n=1805) from four studies involving the subjective items from the Quality of Life Interview (QOLI) [Lehman, A. F. (1988). Evaluation and Program Planning, 11, 51-62]. Detailed item analyses was performed through use of the MULTILOG program [Thissen, 1991. MULTILOG (Version 6). Moorsville, IN: Scientific Software]. Item parameters, their standard errors, item and scale weighted information and subject latent trait levels were obtained. The relationship between IRT information, predicted reliability Samejima, 1994. Applied Psychological Measurement, 18, 229-244] and coefficient } was demonstrated for this data set. Based on the results, including information and reliability levels, several short, customized QOLI scales were created. This graded response model may be used to meet important scale development needs and is appropriate for scales involving ordered, graded categories often used in mental health research. 1999 Elsevier Science Ltd. All rights reserved.

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