How discriminating are discriminative instruments?


Hankins, Matthew (2008) How discriminating are discriminative instruments? Health and Quality of Life Outcomes, 6, 36-[5pp]. (doi:10.1186/1477-7525-6-36).

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Description/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 and evaluation of discriminative instruments, further research is required to elucidate the relationship between the measurement properties of discrimination, reliability and responsiveness

Item Type: Article
ISSNs: 1477-7525
Subjects: R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
Divisions: University Structure - Pre August 2011 > School of Health Sciences
University Structure - Pre August 2011 > School of Education
ePrint ID: 187361
Date Deposited: 17 May 2011 14:44
Last Modified: 27 Mar 2014 19:41
URI: http://eprints.soton.ac.uk/id/eprint/187361

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