# Difficult DOE Design - Help

*From*: "Steve" <spm1@xxxxxxxxxxxxxxxx>*Date*: 26 Jan 2006 06:39:41 -0800

I'm having trouble coming up with a DOE design using Stat-Ease's Design

Expert software for this unusual design. If anyone can offer advise,

I'd appreciate it. This is a combination of mixture, numeric, and

catagorical factors that have certain constraints. There are 2

components I want to mix, A and B. "A" will either be 95% or 100%,

nothing in the middle. And correspondingly, B will either be 5% or 0%.

The numeric process factor C will be one of 3 levels (high, medium or

low). There are 2 catagorical factors related to the 2 mixture

components. Factor A will be from 1 of 3 suppliers. And factor B will

be from 2 suppliers. The problem I'm having is that when factor B is

at 0%, there should be no supplier for it. I can't seem to make this

happen.

Any ideas how to set this up so it works properly?

Thanks, Steve

.

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