I have 3 factors with 3 levels for each experiment which is 27 treatment combinations but due to limited space my proferssor asked me to use orthogonal design and he told me to make around 17. but i don't have experience about it. How do I make the design from 27 to 17? Is there any design generator? I want to study all treatment combinations but I am afraid that some combination will ot be studied if I decrease the treatment combinations. Any one who has information about orthogonal experimental design, please help me. Thank you
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