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Mixture design question

Hello everybody,

 

I would like to know if it is possible to use a Mixture design if we want to study the impact of the proportion of the mixture factors but also the total quantity of the mixture.

Basically I would have two mixture factors (corresponding to the proportion of my 2 components ) and a continuous factor to represent the total quantity of the mixture (e.g. from 100ml to 500ml). Is it possible to do that?

 

Thanks

DOERe: Mixture design question

Yes, you can do this. Your mixture components are expressed in terms of proportions. Your mixture amount would be a continuous factor. This is called a combined mixture-process design. This name will be helpful as you start looking at how you analyze these types of designs. The model is what I would call non-intuitive, so you will likely want to review the modeling approach.

Re: Mixture design question

Many thanks @Dan_Obermiller for this quick answer!

I will follow your advice and investigate about combined mixture-process design.

 

 

Re: Mixture design question

To add just a bit to @Dan_Obermiller 's thoughts you'll definitely want to build the design in JMP's Custom Design platform.

Re: Mixture design question

Thank you for this complement @P_Bartell .

 

I started to read some documentation. If I understand correctly my situation correspond to this example , right?

And a small additional question, if I want to study this kind of experiment but if the design was not created with JMP, I can use the macro "Mixture Response Surface" from the Fit Model platform and remove the main effect term for non-mixture factors that interact with all the mixture factors?