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Perils in clinical use of the Shostrom POI: a reply to Hattie
Institution:1. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada;2. Departments of Internal Medicine/Nephrology and Biomedical and Health Informatics, University of Missouri-Kansas City, Kansas City, MO, USA;3. Unit of Cancer Epidemiology, Scientific Institute of Public Health, Brussels, Belgium;4. Stanford University School of Medicine, Stanford, CA, USA;5. University of Massachusetts Medical School, Worcester, MA, USA;6. University of Zimbabwe, Harare, Zimbabwe;7. University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa;8. International Agency for Research on Cancer, Lyon, France;9. Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA;10. Centers for Disease Control and Prevention, Atlanta, GA, USA;11. McGill University, Montreal, QC, Canada;12. Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA;13. American Cancer Society, Tucson, AZ, USA;14. PATH, Seattle, WA, USA;15. Jhpiego, Baltimore, MD, USA;p. Cancer Prevention and Control PAHO, Washington, DC, USA;q. KK Women''s and Children''s Hospital, Singapore, Singapore;r. Reproductive Health and Research, World Health Organization, Geneva, Switzerland;1. Institute of Inorganic Chemistry of the Czech Academy of Sciences, v.v.i., ALMA Laboratory, 1001 Husinec-Řež, 250 68 Řež, Czech Republic;2. Academy of Fine Arts in Prague, ALMA Laboratory, U Akademie 4, 170 22 Prague 7, Czech Republic
Abstract:Hattie confirms the poor reliabilities of the scales in the POI but notes that the POI has a clear factor structure and speculates that the poor scale reliabilities may simply be due to the generality of the concepts covered. It is noted in reply that the clinician would be scoring Shostrom's unreliable scales rather than Hattie's clear factors and it is shown that the poor reliabilities are not due to conceptual generality.
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