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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).
A control variable is the one that stays the same. A controlled variable is a variable that is kept the same between the control group and experimental group, so that only the â¦ experimental (independent) variable is allowed to change.+ 41 others found this useful.hat are kept constant to ensure that it is only the Independent Variable causing an effect on the Dependent Variable. 2 people found this useful. Edit. Share to: 1  A Look at JavaScript Variable Types Similar to other programming languages, JavaScript variables are containers used to hold values and expressions.