topic Re: How do I extract the desirability formula as a function of the input parameters? in Discussions

How do I extract the desirability formula as a function of the input parameters?

krln — Wed, 27 Jun 2018 08:40:36 GMT

Hi all,

I know how to save the desirability function on the right top of this plot. But I want to somehow save the desirability as a function of the input parameters (so as a function of the force and amplitude in this case) to be able to recreate the plot in another software.

Is this possible and, if so, how can I extract this formula?

Many thanks!

Karlien

Re: How do I extract the desirability formula as a function of the input parameters?

Mark_Bailey — Wed, 27 Jun 2018 10:42:36 GMT

Re: How do I extract the desirability formula as a function of the input parameters?

krln — Wed, 27 Jun 2018 11:06:15 GMT

Hi Mark,

Thank you for your reply. However, if I save the desirability function in this way, it is not a function of the input parameters. Is there a way to obtain the desirability formula directly as a function of the input parameters (amplitude and force in this case)?

Thanks!

Re: How do I extract the desirability formula as a function of the input parameters?

txnelson — Wed, 27 Jun 2018 12:23:25 GMT

The desirability formula can be saved directly to your data table.

It will provide you with the X,Y matrix of points

Re: How do I extract the desirability formula as a function of the input parameters?

Mark_Bailey — Wed, 27 Jun 2018 12:48:21 GMT

I see now. No, you cannot save that formula. But you might still be able to do what you want. How would you use such a formula (i.e., a column formula)? You can save the model as a column formula and then profile it along with any other functions together by selecting Graph > Profiler.

You want to use the desirability in another software? Remember that desirability is a function of the response, D(Y), and the response is a function of the predictor variables, Y=f(X). You should be able to convolute those two functions to compute the desirability given the X.

I should add that JMP saves the desirability formula for D(Y) using a built-in Desirability() function that you will also have to make for yourself in the other software. It is just a mapping so you can use any function or technique supported in the other software. For example, you could use a linear combination for Maximize or Minimize. You could use a Gaussian function for Match Target. You could also use an exponential function. Anything that supports the mapping you want is OK! The choice is up to you.

Re: How do I extract the desirability formula as a function of the input parameters?

krln — Wed, 27 Jun 2018 13:27:17 GMT

I think the convolution between the desirability and the prediction formula of the response should do the trick.

Many thanks for your answer!