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Andreja
Level I

Altering factor values once you have already made the design and the table (CUSTOM DESIGN)

Hello,

 

I am new to DoE and JMP and I am already facing some problems in Custom Design.

 

I have already designed the experiment, meaning, I have alredy clicked "Make a Design" and "Make a Table", when I wanted to change one of the factors value (value range). After changing the values, I clicked "Make a Design" and "Make a Table". Then a new window opened, with new values, but table in the background stayed the same. So I repeated clicking "Make a Design" and "Make a Table" several times. 

 

What it seemed to happen was, that sometimes the new table was completely diffrent to primary table and sometimes everything stayed the same, except for the values I have changed (and also those values have changed equivalently - the highest values for the new highest values and so on).

 

My question is: what is the proper way to change value of factor once the table is already made and what does JMP do?

 

I would be really grateful, if anyone could answer

 

 

Kind regards

Andreja

1 ACCEPTED SOLUTION

Accepted Solutions
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Re: Altering factor values once you have already made the design and the table (CUSTOM DESIGN)

First of all, you have not done anything wrong! JMP behaves this way because experimenters often consider more than one candidate design before selecting the final design.

 

As to the differences between the results, Custom Design is based on an optimization algorithm that starts with a horrible random initial design and then iteratively improves it. There are cases where the nature of the definitions of your factors, models, and so on might have more than one solution or optimal design. When you click Back, you are telling JMP that you don't want this design and try to make another. Only if there is just one solution will you get the same result every time.

 

If you are only changing factor levels, then close the latest data table, click Back, edit the factor levels, and click Make Design again.

 

If you already ran the experiment but were unable to achieve the desired factor levels, then edit the data table to reflect the actual levels for each run.

Learn it once, use it forever!

View solution in original post

2 REPLIES 2
Highlighted

Re: Altering factor values once you have already made the design and the table (CUSTOM DESIGN)

First of all, you have not done anything wrong! JMP behaves this way because experimenters often consider more than one candidate design before selecting the final design.

 

As to the differences between the results, Custom Design is based on an optimization algorithm that starts with a horrible random initial design and then iteratively improves it. There are cases where the nature of the definitions of your factors, models, and so on might have more than one solution or optimal design. When you click Back, you are telling JMP that you don't want this design and try to make another. Only if there is just one solution will you get the same result every time.

 

If you are only changing factor levels, then close the latest data table, click Back, edit the factor levels, and click Make Design again.

 

If you already ran the experiment but were unable to achieve the desired factor levels, then edit the data table to reflect the actual levels for each run.

Learn it once, use it forever!

View solution in original post

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Andreja
Level I

Re: Altering factor values once you have already made the design and the table (CUSTOM DESIGN)

Thank You very much for reply

KInd regards
Andreja
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