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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 You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.