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psychological measurement, psychometrics, questionnaires, reliability, reproducibility of results, Self-Care of Heart Failure Index



  1. Barbaranelli, Claudio
  2. Lee, Christopher S.
  3. Vellone, Ercole
  4. Riegel, Barbara


Knowledge of a scale's dimensionality is an essential preliminary step to the application of any measure of reliability derived from classical test theory-an approach commonly used is nursing research. The focus of this article is on the applied aspects of reliability and dimensionality testing. Throughout the article, the Self-Care of Heart Failure Index is used to exemplify real-world data challenges of quantifying reliability and to provide insight into how to overcome such challenges.