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experimenter effect

noun
1.
(psychol) the influence of an experimenter's expectations on his results
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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experimenter effect in Medicine

experimenter effect n.
The influence of the experimenter's behavior, personality traits, or expectancies on the results of his or her own research.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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