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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: How discriminating are discriminative instruments? Matthew Hankins1,2,3 | BioMed Central Health and Quality of Life Outcomes Review How discriminating are discriminative instruments Matthew Hankins1 2 3 Open Access Address 1King s College London Department of Psychology at Guy s Institute of Psychiatry London UK 2Department of Primary Care Public Health Brighton Sussex Medical School Brighton UK and 3Brighton Sussex University Hospitals NHS Trust Royal Sussex County Hospital Brighton UK Email Matthew Hankins - m.c.hankins@bsms.ac.uk Published 27 May 2008 Received 3 I October 2007 Health and Quality of Life Outcomes 2008 6 36 doi 10.1186 1477-7525-6-36 Accepted 27 May 2008 This article is available from http www.hqlo.cOm content 6 1 36 2008 Hankins licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http creativecommons.org licenses by 2.0 which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract The McMaster framework introduced by Kirshner Guyatt is the dominant paradigm for the development of measures of health status and health-related quality of life HRQL . The framework defines the functions of such instruments as evaluative predictive or discriminative. Evaluative instruments are required to be sensitive to change responsiveness but there is no corresponding index of the degree to which discriminative instruments are sensitive to cross-sectional differences. This paper argues that indices of validity and reliability are not sufficient to demonstrate that a discriminative instrument performs its function of discriminating between individuals and that the McMaster framework would be augmented by the addition of a separate index of discrimination. The coefficient proposed by Ferguson Delta is easily adapted to HRQL instruments and is a direct non-parametric index of the degree to which an instrument distinguishes between individuals. While Delta should prove useful in the development .
