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Re: st: Identifying the best scale without a "gold standard"

From   "Seed, Paul" <>
To   "" <>
Subject   Re: st: Identifying the best scale without a "gold standard"
Date   Wed, 16 Nov 2011 11:48:49 +0000

Thank you Ronan.  A good point, well made.

Paul T Seed MSc CStat CSci, Senior Lecturer in Medical Statistics, 
King's College London, Division of Women's Health
(& Department of Primary Care and Public Health Sciences)
St Thomas' Hospital, Westminster Bridge Road, London SE1 7EH

On Tue, 15 Nov 2011 09:53:29 +0000 Ronan Conroy <> wrote: 
>Subject: Re: st: Identifying the best scale without a "gold standard"

>On 2011 Samh 14, at 20:53, Seed, Paul wrote:
>> The research problem is to identify the best single scale for measuring breathlessness 
>> from the six candidates.  I was therefore interested in a valid test for 
>> identifying agreement of individual measures with a latent factor
>> to which they all contributed.
>The definition of 'best scale' is not without its difficulty. In most cases, scales are expected to make both longitudinal and cross-sectional measurements. >For this reason, the ability to detect difference between groups that ought to be different, and to detect change in individuals when such change can >reasonably be expected is also important. 
>Ronán Conroy
>Associate Professor
>Division of Population Health Sciences
>Royal College of Surgeons in Ireland
>Beaux Lane House
>Dublin 2
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