DOE help needed: how to design an orthogonal array of 5 factors each with 5 levels
I tried the Screening Design in JMP 12 and used discrete numbericals for these five factors. With 5 levels, it gives me the minimum 21 experiments. I want all experiments to the orthogonal as possible. 21 experiments are too many. Is there a way to use factional factorial design in JMPs to reduce the number of experiments?