Fit two-level screening doesn't give the same result when replicated. Why?

baleman — Fri, 09 Jun 2023 00:50:25 GMT

Hello,

I noticed something odd recently when running the "fit two-level screening" analysis in JMP under the DOE:Classical:Two-level Screening menu. With the exact same data table, the analysis does not give the exact same results (see below for three examples). While the A-B-C contrasts themselves are the same each time, the Null contrasts are not. So the half normal quantiles look different. Does anyone know why these come up different each time?

Re: Fit two-level screening doesn't give the same result when replicated. Why?

jthi — Sun, 05 Jun 2022 20:22:55 GMT

I think the reason is explained here: Design of Experiments Guide > The Fit Two Level Screening Platform > The Screening Report > Contrasts (jmp.com)

Note: Do not expect the p-values to be exactly the same if the analysis is re-run. The Monte Carlo method should give similar, but not identical, values if the same analysis is repeated.

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Fit two-level screening doesn't give the same result when replicated. Why?

Re: Fit two-level screening doesn't give the same result when replicated. Why?