Hello:
I am just trying to understand the reason behind different experiments in factorial and custom design.
I have three factors all of them are continuous. Two factors have three levels while one factor has two level.
I initially did a normal full factorial design having 18 experiments with no replicates.
Below is the experiment set-up that I got
Below plot shows the wing_length vs base_length experiments and we can see points at all the levels.
Than I created the design using custom design and entered the exact factor levels with no factor constraints.
Below is the set up and design table that I got. I have also plotted the wing_length vs base_length experiments. There are no midpoints (4.5) considered in the design experiments. Is there any specific reason for that?
Any help is highly appreciated.
Best Regards,
Varun Katiyar
In the custom design, you did not specify any quadratic effects, so you are just getting the linear effects you asked for (necessary).
Than you statman that worked.
