How should I set DoE design when there are some operationally dependent parameters ?
For my experiment, I have two variables: (1) additive concentration (0, 1, 5 mg/L) and (2) timing for additive supplementation (during cell seeding, during plasmid transfection). Since the timing becomes irrelevant when the additive concentration is 0 mg/L, how could I assign the factors / their levels that account for this operational dependency during designing DoE using JMP ?