Factors under Response Surface Design

RONS — Wed, 06 Mar 2024 21:24:22 GMT

Hello Team,

Am new to JMP. See below the extract, under values (circled red) which kind of factors values do we put to replace the -1 and 1?

I will be waiting for response from some one.

Thanks

Re: Factors under Response Surface Design

Victor_G — Thu, 07 Mar 2024 07:25:17 GMT

Hi @RONS,

Welcome in the Community !

By default when you create a design, the factors are added with their coded levels, meaning the low level is at -1 and the high level is at +1. Of course, feel free to change the names of the factors and the values/ranges for each of them, by changing each -1 with the low value for each factor's range, and each +1 with the high value for each factor's range.

The coding done on the factors values in Design of Experiments is here for several reasons :

to help compare different factors with various ranges size (else keeping the original values and ranges will make the comparison of effects really more difficult, if not impossible in certain cases),
to reduce multicollinearity in models when including interactions and higher order terms (polynomials are also centered beside the -1/+1 scaling).

You can find more infos about it in the JMP Help section about Coding

Are you familiar with DoE already ?

If not, you can find a lot of interesting ressources to get started here : https://community.jmp.com/t5/Design-of-Experiments-Club/DoE-Resources/m-p/635455

Hope this answer will help you get started !

Re: Factors under Response Surface Design

RONS — Thu, 07 Mar 2024 13:33:42 GMT

Thanks Victor. This has answered my question. Thanks also for the information to familiarize myself more with JMP.

Paul

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