Your assessment seems makes sense to me. I would say that the one describes the individuals you see and the other those you don't but they are, as you say, two sides of the same coin.
Stephen
Stephen Senn
Professor of Statistics
School of Mathematics and Statistics
Direct line: +44 (0)141 330 5141
Fax: +44 (0)141 330 4814
Private Webpage: http://www.senns.demon.co.uk/home.html
University of Glasgow
15 University Gardens
Glasgow G12 8QW
The University of Glasgow, charity number SC004401
________________________________________
From: A UK-based worldwide e-mail broadcast system mailing list [[log in to unmask]] On Behalf Of Dr Philip Sedgwick [[log in to unmask]]
Sent: 27 June 2011 15:29
To: [log in to unmask]
Subject: Volunteer bias / non-response bias
Dear fellow Allstaters
Was wondering if anyone has an opinion on the definitions of volunteer
bias and non-response bias, especially in context of questionnaire
surveys. There is some potential overlap but I do not believe that one
is a simple inverse of the other.
Any thoughts
Best wishes
Philip Sedgwick
__________________________________________
Dr. Philip Sedgwick
Senior Lecturer in Medical Statistics,
Academic Lead and Chief Examiner for SSCs and Projects
Section of Medical and Healthcare Education,
Room 6.30, Sixth Floor, Hunter Wing
St. George's, University of London,
London SW17 0RE
Telephone +44 20 8725 5551
Fax +44 20 8725 3584
Email [log in to unmask]
Twitter: http://twitter.com/#!/Statistics_Man
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