Abstract
The purpose of this study was to estimate the variance components associated with individual differences and various sources of measurement error of Caregiver Strain Index (CSI). A two-facet (item and occasion) crossed design generalizability study (G study) was conducted using a sample of 14 caregivers of cancer patients. Based on the findings of the G study, alternative decision studies were then designed to search for optimal generalizability of CSI. The measurement of CSI was not reliable with a single test. Averaging two or more measurements would make CSI scores more generalizable for either relative or absolute assessment of caregiver strain.
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