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VarunK
Level III

Difference between factorial design and custom design

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

 

VarunK_1-1692808868154.png

Below plot shows the wing_length vs base_length experiments and we can see points at all the levels.

VarunK_0-1692808804278.png

 

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?

VarunK_2-1692809121009.png

 

VarunK_3-1692809141090.png

Any help is highly appreciated.

 

Best Regards,

Varun Katiyar

1 ACCEPTED SOLUTION

Accepted Solutions
statman
Super User

Re: Difference between factorial design and custom design

In the custom design, you did not specify any quadratic effects, so you are just getting the linear effects you asked for (necessary).

"All models are wrong, some are useful" G.E.P. Box

View solution in original post

2 REPLIES 2
statman
Super User

Re: Difference between factorial design and custom design

In the custom design, you did not specify any quadratic effects, so you are just getting the linear effects you asked for (necessary).

"All models are wrong, some are useful" G.E.P. Box
VarunK
Level III

Re: Difference between factorial design and custom design

Than you statman that worked.