Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí hóa học quốc tế đề tài : Discrimination and reliability: equal partners? Understanding the role of discriminative instruments in HRQoL research: can Ferguson's Delta help? A response | BioMed Central Health and Quality of Life Outcomes Letter to the Editor Discrimination and reliability equal partners Understanding the role of discriminative instruments in HRQoL research can Ferguson s Delta help A response 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 - Published 16 October 2008 Received 6 August 2008 Health and Quality of Life Outcomes 2008 6 83 doi 1477-7525-6-83 Accepted 16 October 2008 This article is available from http content 6 1 83 2008 Hankins licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract A response to Norman GR Discrimination and reliability equal partners and Wyrwich KW Understanding the role of discriminative instruments in HRQoL research can Ferguson s Delta help Response I would like to thank Norman and Wyrwich for their close reading of my article 1 and also the editors for inviting this debate. It is a welcome opportunity to clarify some points and expand upon others. I should like to begin by re-stating what coefficient Delta is and what it is not. Delta is the ratio of observed discriminations made to the maximum possible number it ranges from 0 no discriminations at all are made to 1 all possible discriminations are made for a given sample size and scale range . Discriminations means between-persons differences which is to say two people are discriminated if they score differently on the instrument and not discriminated if they score the same. This
