Has Two or More Independent Variables?

By far the most common approach to including multiple independent variables in an experiment is the factorial design. In a factorial design , each level of one independent variable (which can also be called a factor) is combined with each level of the others to produce all possible combinations.

Can you have 2 independent variables?

There are often not more than one or two independent variables tested in an experiment, otherwise it is difficult to determine the influence of each upon the final results. There may be several dependent variables, because manipulating the independent variable can influence many different things.

What are two independent variables?

Intuitively, two random variables X and Y are independent if knowing the value of one of them does not change the probabilities for the other one. In other words, if X and Y are independent, we can write P(Y=y|X=x)=P(Y=y), for all x,y.