The Fractionator Principle. The fractionator principle is one of the important concepts used in stereology. The importance of this principle cannot be overlooked. It appears in many different places. Although it looks different depending on how it is used, the principle is the same.
In mathematics, a variable whose value is determined by the value of an independent variable. For example, in the formula for the area of a circle, A = Ïr2, A is the dependent variable, as its value depends on the value of the radius (r). Compare independent variable.
1 A variable is an attribute that describes a person, place, thing, or idea. 2  The value of the variable can vary from one entity to another.  For example, suppose we let the variable x represent the color of a person's hair. The variable x could have the value of blond for one person, and brunette for another. When the value of a variable is the outcome of a statistical experiment , that variable is a random variable. 1  AP Statistics.  Statistics and Probability.