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 tr ...
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