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Open AccessLetter to the Editor

Understanding Ferguson's δ: time to say good-bye?

Berend Terluin1 email, Dirk L Knol2 email, Caroline B Terwee2 email and Henrica CW de Vet2 email

Department of General Practice and the EMGO Institute for Health and Care Research, VU University Medical Centre, Amsterdam, the Netherlands

Department of Clinical Epidemiology and Biostatistics, and the EMGO Institute for Health and Care Research, VU University Medical Centre, Amsterdam, the Netherlands

author email corresponding author email

Health and Quality of Life Outcomes 2009, 7:38doi:10.1186/1477-7525-7-38

Published: 30 April 2009

Abstract

A critique of Hankins, M: 'How discriminating are discriminative instruments?' Health and Quality of Life Outcomes 2008, 6:36.


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