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(psychol) the influence of an experimenter's expectations on his results. 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.
Any dependent variable will be affected by the independent variable and will serve as the outcome of the measured. In an experiment, the experimenter is looking for the possible effect on the dependent variable that might be caused by changing the independent variable.