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Custom DOE with Disallowed Combinations Scr

Hi,

I have 5 factors for a custom DOE and I need two linear constraints:

Mean(CAP + RAP + OAP + EAP) + 10 < RRP
Max(CAP, RAP, OAP, EAP) - Min(CAP, RAP, OAP, EAP) < 150

</CODE>It is ok for CAP, RAP, OAP, EAP and RRP to vary significantly between 100 and 500, but if they vary, I want them to be somewhat close together. For example 450,400,350,450,500 is ok, but 100,500,100,500,500 is not. I've tried the below constraint. The design calculates, but the constraint is not applied.<PRE><CODE class=" language-jsl">AND( Mean(CAP + RAP + OAP + EAP)+10 < RRP, Max( CAP, RAP, OAP, EAP )- Min( CAP, RAP, OAP, EAP )<150)

Thanks for your help

Accepted answers

Mark_Bailey

I have used all the methods for specifying constraints. I never encountered a situation before where I did not get a design with the desired runs. I do not know why it is not working now. I got much better results, though, by using Or() instead of And() to consider both constraints.

I attached my design data table and a script for the custom design. I suggest that you contact JMP Technical Support ( support@jmp.com ) for more help. Please report back here if you learn the nature of the problem and the resolution.

Custom Design for Pressure Experiment for Polishing Tool.jsl

Pressure Experiment for Polishing Tool.jmp

All comments

Mark_Bailey

I think the syntax for the call to the Maximum() function is incorrect. Try this code instead:

And( Mean( CAP, RAP, OAP, EAP ) + 10 < RRP, Max( CAP, RAP, OAP, EAP ) - Min( CAP, RAP, OAP, EAP ) < 150 )

Thanks, but it did not work. In fact I cannot spot the difference between both formulas - did you maybe copy the wrong one?

Mark_Bailey

The difference is that your version had a single argument for the Mean() function (the sum of the factor levels) and my version has four arguments for the same Mean() function (the individual factor levels).

I don't know why the expression did not work. Remember that when the expression evaluates true, the current treatment is disallowed. Do you want to change your logic?

Oh yes, that plus was nonsense, thanks. This condition works now, but the Max-Min does not. Also I got the logic wrong, I changed the <>.
I am trying it with a very simple condition such as

Mean( CAP, RAP, OAP, EAP ) + 10 > RRP & CAP - RAP > 10

but still this one is not applied. I get DOE suggestions with CAP=350 and RAP=150.