what is active independent variable
The independent variable DRUG would be an active independent variable. An attribute independent variable occurs when groups are compared, but the grouping variable cannot be chosen and manipulated by the investigators because it is a characteristic of the subjects themselves.Example 7: One example of an attribute variable is gender.here may be up to 3-5 groups per variable, but usually not more than that. Example 4: If a study is comparing two types of treatments: a placebo and an experimental treatment, the independent variable is treatment and it has two levels: placebo and experimental.