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DoE - Number of runs in Plackett-Burman (Minitab)

Jafri

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#1
I am trying to get a screening design of Plackett-Burman using 7 factors.
The “Display Available Designs…” tab says that for 7 factors, we will need 8 runs.
Yet when I go to the next “Designs…” tab then the number of runs available are at least 12!
8 runs is not even an option here.

Thus, when design is generated, it has 12 runs for those 7 factors.

Why does Minitab give 8 available runs when we have to run at least 12 anyway?
 

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