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Jul 8, 2014 4:07 PM
(367 views)

Hi there,

I am using a Response Surface Design with 3 levels for each factor. The factor levels are not equally spaced because I chose the values of the factors at the centre point so that the response is approx 50% of the range that I am exploring. I have two doubts:

1) Choosing the factor values for centre point to give 50% of the response range is the right way?

2) Is there any guidelines to code the factors when they are not equally spaced?

Thank you in advance

3 REPLIES

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Jul 8, 2014 6:57 PM
(269 views)

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Jul 9, 2014 8:01 AM
(269 views)

Dear LouV,

Thank you for your response. I have been shortly exploring the use of discrete numeric factors. Nevertheless, in the case that I am analysing my factors are continuous, so I do not have the limitation of discrete values.

I might posed my question in the wrong way. My question is:

the values of the factors at centre point of CDD design should be at the mean value of the range of factors?

or the values of the factors at the centre point should give a 50% of variation of response respect to the range that it is being explored?

Thank you again.

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Jul 9, 2014 10:37 AM
(269 views)