random assignment
Definition:
The essential experimental manipulation, whereby other influences that participants bring to experiments are controlled by cancelling each other out by being ignored by the random assignment.
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© Westburn Publishers Ltd 2002, The Westburn Dictionary of Marketing edited by Michael J Baker, ISBN 978-0-946433-01-8. www.themarketingdictionary.com. Entry: [Stephen K. Tagg], [1998].