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Re: st: Elimination of outliers


From   Ronan Conroy <rconroy@rcsi.ie>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Elimination of outliers
Date   Tue, 7 Jun 2011 10:30:24 +0100

On 2011 Meith 6, at 15:07, Achmed Aldai wrote:

> Hi
> 
> sorry I cannot really understand why it is a bad idea. I want to eliminate the outliers beacuse I think they cause a bias in my results. 


Bias arises from systematic error. Any process which causes data to be missing will increase error (lower precision) by reducing the amount of data. Removing data deliberately because you don't like the look of it is a systematic error. 

 


Ronán Conroy
rconroy@rcsi.ie
Associate Professor
Division of Population Health Sciences
Royal College of Surgeons in Ireland
Beaux Lane House
Dublin 2


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