I wish to optimize a DOE response based on 13 variables, one which is based on a resistance. I have two resistors, so can only have those two nominal values come up in the DOE table. However, I wish to optimize the resistance required, so wish to model as if the variable were continuous. I can then find a resistor to match the optimum resistance. e, How should I label the factor? Continuous? Categorical? And what about the:

Data Type: Numeric, Character or Row State?

Modeling Type: Continuous, Ordinal, Nominal?

Design Role: Categorical, Continuous, Blocking, Covariate, Mixture, Constant, Signal, Noise, Uncontrolled, Random Block?

Thanks