Abstract
The goal of this article consists of describing the calibration of an instrument to assess quality of life-related personal outcomes using Rasch analysis. The sample was composed of 3.029 recipients of social services from Catalonia (Spain) and was selected using a probabilistic polietapic sample design. Results related to unidimensionality, item and person separation reliability, calibration, items’ level of difficulty, response categories and differential item functioning by gender and type of collective are provided and point out the general fit of the data to the model. However, it is recommended to include more difficult items and eliminate one that seems not to be adequate.
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Notes
GENCAT is an acronym of “Generalitat de Catalunya”; it means "Government of Catalonia" in Catalonian.
References
Andrich, D. (1978). Application of a psychometric rating model to ordered categories which are scored with successive integers. Applied Psychological Measurement, 2, 581–594. doi:10.1177/014662167800200413.
Bonham, G. S., Basehart, S., Schalock, R. L., Marchand, C. G., Kirchner, N., & Rumenap, J. M. (2004). Consumer-based quality of life assessment: The Maryland Ask Me! Project. Mental Retardation, 42, 338–355. doi:10.1352/0047-6765(2004)42<338:CQOLAT>2.0.CO;2.
Claes, C., van Hove, G., van Loon, J., Vandevelde, S., & Schalock, R. L. (2009). Quality of life measurement in the field of intellectual disabilities: Eight principles for assessing quality of life-related personal outcomes. Social Indicator Research,. doi:10.1007/s11205-009-9517-7.
Cummins, R. A. (2005). Moving from the quality of life concept to a theory. Journal of Intellectual Disability Research, 49, 699–706. doi:10.1111/j.1365-2788.2005.00738.x.
Jenaro, C., Verdugo, M. A., Caballo, C., Balboni, G., Lachapelle, Y., Otbrebski, W., et al. (2005). Cross-cultural study of person-centered quality of life domains and indicators: A replication. Journal of Intellectual Disability Research, 49, 734–739. doi:10.1111/j.1365-2788.2005.00742.x.
Keith, K. D., & Bonham, G. S. (2005). The use of quality of life data at the organization and systems level. Journal of Intellectual Disability Research, 49, 799–805. doi:10.1111/j.1365-2788.2005.00755.x.
Keith, K. D., & Schalock, R. L. (2000). Cross-cultural perspectives on quality of life. Washington, DC: American Association on Mental Retardation.
Linacre, J. M. (2002). What do infit and outfit, mean square and standardized mean? Rasch Measurement Transactions, 12(2), 878. Retrieved from http://www.rasch.org/rmt/rmt162f.html.
Linacre, J. M. (2008). Winsteps. Rasch measurement computer program (computer software). Chicago, IL: Winsteps.com.
Linacre, J. M. (2010, January 16). WINSTEPS & facets Rasch software. Retrieved from http://www.winsteps.com/index.htm.
Linacre, J. M., & Wright, B. D. (1999). A user’s guide to WINSTEPS, BIGSTEPS, MINISTEP Rasch model computer programs. Chicago, IL: MESA Press.
Perry, J., & Felce, D. (2005). Factors associated with outcomes in community group homes. American Journal on Mental Retardation, 110, 121–135. doi:10.1352/0895-8017(2005)110<121:FAWOIC>2.0.CO;2.
Rasch, G. (1960). Probabilistic models for some intelligence and attainment tests. Copenhagen: Danish Institute for Educational Research.
Rasch, G. (1980). Probabilistic models for some intelligence and attainment tests. Chicago, IL: MESA Press.
Rasch, G. (1992). Probabilistic models for some intelligence and attainment tests. Chicago, IL: MESA Press.
Schalock, R. L., & Bonham, G. S. (2003). Measuring outcomes and managing for results. Evaluation & Program Planning, 26, 229–235.
Schalock, R. L., & Felce, D. (2004). Quality of life and subjective well-being: Conceptual and measurement issues. In E. Emerson, C. Hatton, T. Thompson, & T. R. Parmenter (Eds.), International handbook of applied research in intellectual disabilities (pp. 261–279). London: Wiley.
Schalock, R. L., Gardner, J. F., & Bradley, V. J. (2007). Quality of life for people with intellectual and other developmental disabilities. Applications across individuals, organizations, communities, and systems. Washington, DC: American Association on Intellectual and Developmental Disabilities.
Schalock, R. L., Keith, K. D., Verdugo, M. A., & Gomez, L. E. (2010). Quality of life model development in the field of intellectual disability. In R. Kober (Ed.), Quality of life for people with intellectual disability (pp. 17–32). New York: Springer.
Schalock, R. L., & Verdugo, M. A. (2002). Quality of life for human service practitioners. Washington, DC: American Association on Mental Retardation.
Schalock, R. L., & Verdugo, M. A. (2007). El concepto de calidad de vida en los servicios y apoyos para personas con discapacidad intelectual. Siglo Cero, 38, 21–36.
Schalock, R. L., Bonham, G. S., & Verdugo, M. A. (2008a). The conceptualization and measurement of quality of life: Implications for program planning and evaluation in the field of intellectual disabilities. Evaluation and Program Planning, 31(2), 181–190. doi:10.1016/j.physletb.2003.10.071.
Schalock, R. L., Verdugo, M. A., Bonham, G. S., Fantova, F., & Van Loon, J. (2008b). Enhancing personal outcomes: Organizational strategies, guidelines, and examples. Journal of Policy and Practice in Intellectual Disabilities, 5, 18–28. doi:10.1111/j.1741-1130.2007.00135.x.
Schalock, R. L., Verdugo, M. A., Jenaro, C., Wang, M., Wehmeyer, M., Xu, J., et al. (2005). A cross-cultural study of quality of life indicators. American Journal on Mental Retardation, 110, 298–311. doi:10.1352/0895-8017(2005)110[298:CSOQOL]2.0.CO;2.
Van Loon, J., van Hove, G., Schalock, R. L., & Claes, C. (2008). Personal outcomes scale. Middleburg, Holland: Arduin Steichlich.
Verdugo, M. A., Arias, B., Gómez, L. E., & Schalock, R. L. (2008a). Formulari de l’Escala Gencat de Qualitat de vida. Manual d’aplicació de l’Escala Gencat de Qualitat de vida. Barcelona: Departamento de Acción Social y Ciudadanía, Generalitat de Cataluña.
Verdugo, M. A., Arias, B., Gómez, L. E., & Schalock, R. L. (2008b). Escala GENCAT. Informe sobre la creació d’una escala multidimensional per avaluar la qualitat de vida de les persones usuàries dels serveis socials a Catalunya. Barcelona: Departamento de Acción Social y Ciudadanía, Generalitat de Cataluña.
Verdugo, M. A., Arias, B., Gómez, L. E., & Schalock, R. L. (2009a). Formulario de la Escala GENCAT de Calidad de vida. Manual de aplicación de la Escala GENCAT de Calidad de vida. Barcelona: Departamento de Acción Social y Ciudadanía, Generalitat de Cataluña.
Verdugo, M. A., Arias, B., Gómez L. E., & Schalock, R. L. (2010). Development of an objective instrument to assess quality of life in social services: Reliability and validity in Spain. International Journal of Clinical and Health Psychology, 10(1), 105–123. Retrieved from http://www.aepc.es/ijchp/articulos_pdf/ijchp-343.pdf.
Verdugo, M. A., Gómez, L. E., & Arias, B. (2007a). La Escala INTEGRAL de calidad de vida: desarrollo y estudio preliminar de sus propiedades psicométricas. Siglo Cero, 38, 37–56.
Verdugo, M. A., Gómez, L. E., Arias, B., & Schalock, R. L. (2009b). Escala Integral de Calidad de Vida. CEPE: Madrid.
Verdugo, M. A., Schalock, R. L., Gómez, L. E., & Arias, B. (2007b). Construcción de escalas de calidad de vida multidimensionales centradas en el contexto: la Escala GENCAT. Siglo Cero, 38, 57–72.
Verdugo, M. A., Schalock, R. L., Keith, K., & Stancliffe, R. (2005). Quality of life and its measurement: Important principles and guidelines. Journal of Intellectual Disability Research, 49, 707–717. doi:10.1111/j.1365-2788.2005.00739.x.
Walsh, P., Erickson, E., Bradley, V., Moseley, C., & Schalock, R. L. (2006). Supported accommodation services for people with intellectual disabilities: A review of models and instruments used to measure quality of life in various settings. Dublin: National Disability Authority.
Wright, B. D., & Masters, G. N. (1982). Rating scale analysis. Chicago, IL: MESA Press.
Acknowledgments
Work on this research was partially supported by a grant (EDU/894/2009) given to the Excellence Group of Research (GR197) by the Junta de Castilla y León (Spain). It was also founded by the Catalan Welfare and Social Services Institute (ICASS, Generalitat of Catalonia) and the Science and Technology Ministry (R&D Projects, 2009) (PSI2009-10953).
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Gomez, L.E., Arias, B., Verdugo, M.Á. et al. An Outcomes-Based Assessment of Quality of Life in Social Services. Soc Indic Res 106, 81–93 (2012). https://doi.org/10.1007/s11205-011-9794-9
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DOI: https://doi.org/10.1007/s11205-011-9794-9