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st: RE: Meta-Regression: Data dredging


From   Leonelo Bautista <lebautista@wisc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: RE: Meta-Regression: Data dredging
Date   Wed, 03 Dec 2003 08:43:53 -0600

Data dredging is equivalent to "statistical fishing". In data-sets with
a large number of variables (risk factors and/or outcomes) you can
conduct a large number of statistical tests. Some of these tests will be
significant just by chance (5% if you use a 0.05 cut point for
statistical significance), leading to false positive findings. See
"Smith GD, Ebrahim S. Data dredging, bias, or confounding. They can all
get you into the BMJ and the Friday papers. BMJ 2002;325:1437-1438 (21
December)". Is available online at
http://bmj.bmjjournals.com/cgi/reprint/325/7378/1437


Leonelo E. Bautista, MD, DrPH
Assistant Professor
University of Wisconsin Medical School
Population Health Sciences
610 Walnut Street, 703 WARF
Madison, WI 53726-2397
Phone: (608)265-6176
Fax: (608)263-2820

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Xavi Barber
Sent: Wednesday, December 03, 2003 4:45 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Meta-Regression: Data dredging

Dears statalisters,

I'm a spanish researcher, I'm working in Public Health in
Alicante(Spain).

I'm reading about Meta-regression, but I don't undernstant the meaning
of 
the word DATA DREDGING.

Can You  help me?




thanks

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