Identifying response shift statistically at the individual level
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The purpose of this study was to explore whether a longitudinal comparison between reported and predicted health could be used as a method of identifying subjects who potentially experienced response shift.
A response-shift model was developed using data from a longitudinal study of stroke in which measures of stroke impact were made at study entry and at 1, 3, 6, and 12 months post stroke. Residuals from a random effects model were centered and used to create trajectories. This model was tested against a data set from a study in which the then-test had been administered. Twenty simulated data sets were also generated to examine how much of response shift could be attributed to random error.
Group-based trajectory analysis identified seven trajectory groups. The majority (67%) of the 387 persons showed no response shift over time, whereas 15% lowered and 13% raised their health over time, disproportionally to that predicted.
Results of the validation studies were supportive that this methodology identifies response shift, but further research is required to compare results with other methodologies and other predictive models.
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- Identifying response shift statistically at the individual level
Quality of Life Research
Volume 17, Issue 4 , pp 627-639
- Cover Date
- Print ISSN
- Online ISSN
- Springer Netherlands
- Additional Links
- Response shift
- Measurement of change
- Quality of life
- Cerebrovascular accident
- Industry Sectors
- Author Affiliations
- 1. Division of Clinical Epidemiology, McGill University Health Center, Montreal, QC, Canada
- 2. Department of Medicine and School of Physical and Occupational Therapy, McGill University, Montreal, QC, Canada
- 3. Department of Epidemiology and Biostatistics, McGill University, Montreal, QC, Canada
- 4. Division of Clinical Epidemiology, R4.29, Royal Victoria Hospital, 687 Pine Avenue West, Montreal, QC, Canada, H3A 1A1
- 5. School of Physical and Occupational Therapy, McGill University, Montreal, QC, Canada