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The use of latent variable mixture models to identify invariant items in test construction

, Trinity Western University , 7600 Glover Rd, Langley, BC V2Y1Y1 , Canada 2 & Richard Sawatzky 3 Measurement, Evaluation & Research Methodology Program, University of British Columbia , Vancouver, BC

The Accuracy of Computerized Adaptive Testing in Heterogeneous Populations: A Mixture Item-Response Theory Analysis

Background Computerized adaptive testing (CAT) utilizes latent variable measurement model parameters that are typically assumed to be equivalently applicable to all people. Biased latent variable scores may be obtained in samples that are heterogeneous with respect to a specified measurement model. We examined the implications of sample heterogeneity with respect to CAT-predicted ...

Differential Item Functioning in the SF-36 Physical Functioning and Mental Health Sub-Scales: A Population-Based Investigation in the Canadian Multicentre Osteoporosis Study

Background Self-reported health status measures, like the Short Form 36-item Health Survey (SF-36), can provide rich information about the overall health of a population and its components, such as physical, mental, and social health. However, differential item functioning (DIF), which arises when population sub-groups with the same underlying (i.e., latent) level of health have ...

Foreward to the ARQOL Special Edition on Religion/Spirituality and Quality of Life

adolescent respondents. An Investigation of the Relationships Between Spirituality, Health Status and Quality of Life in Adolescents by Richard Sawatzky, Anne Gadermann and Barbara Pesut is set in British

Self-reported physical and mental health status and quality of life in adolescents: a latent variable mediation model

Background We examined adolescents' differentiation of their self-reported physical and mental health status, the relative importance of these variables and five important life domains (satisfaction with family, friends, living environment, school and self) with respect to adolescents' global quality of life (QOL), and the extent to which the five life domains mediate the ...

Physical activity as a mediator of the impact of chronic conditions on quality of life in older adults

Background Chronic conditions could negatively affect the quality of life of older adults. This may be partially due to a relative lack of physical activity. We examined whether physical activity mediates the relationship between different chronic conditions and several health outcomes that are important to the quality of life of older adults. Methods The data were taken from the ...