The instrument effect is an issue in
experimental methodology meaning that any change during the measurement, or, the instrument, may influence the research validity.
For example, in a
control group
In the design of experiments, hypotheses are applied to experimental units in a treatment group.
In comparative experiments, members of a control group receive a standard treatment, a placebo, or no treatment at all. There may be more than one t ...
design experiment, if the instruments used to measure the performance of the experiment group and the control group are different, a wrong conclusion about the experiment would be reached, the research result would be invalid.
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References
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Experimental bias