An independent variable is a value which is not dependent on other factors in the equation or experiment. This variable is operated by an experimenter to observe the effect on the dependent variable(s). In effect this is an operational measure, using the independent variable's values as the yardstick for its effects. The use of independent variables is a particularly effective experimental technique, because the value of the independent variable can be accurately measured at all times.
Examples of Independent Variables:
|Variable effects of throwing a rock in the water are measured by the size of the rock, which is the independent variable.|
In the equation E= mc2 the independent variable is m.