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Design of Experiments. Design of Experiments (DOE) is a study of the factors that the team has determined are the key process input variables (KPIV's) that are the source of the variation or have an influence on the mean of the output. A DOE (or set of DOE's) will help develop a prediction equation for the process in terms of Y = f(X1,X2,X3,X4,....Xn).
The opposite of a variable is a constant. A constant is a quantity that doesnât change within a specific context. In scientific experiments, variables are used as a way to group the data together. Variables can be grouped as either discrete or continuous variables. Generally, variables are characteristics of a group of objects or events that can be measured over a number of different numerical values. Discrete variables can have only a certain number of different values between two given points.