Control variable
Experimental element which is not changed throughout the experiment / From Wikipedia, the free encyclopedia
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Not to be confused with Control variable (programming) or Control variable (statistics).
A control variable (or scientific constant) in scientific experimentation is an experimental element which is constant (controlled) and unchanged throughout the course of the investigation. Control variables could strongly influence experimental results were they not held constant during the experiment in order to test the relative relationship of the dependent variable (DV) and independent variable (IV). The control variables themselves are not of primary interest to the experimenter.