Measurement System Analysis Bias Comparison vs ANOM decision limits

Josh1 — Sun, 11 Jun 2023 11:28:25 GMT

I'm curious why the decision limits for the Bias comparison ANOM in the MSA tool are narrower than those generated by fit Y by X.

From MSA

Same data but from the Y/X tool:

The Y/X limits are 2X wider than the MSA limits.

Both charts are using a sample size of 30.

I believe these are the ANOM decision limit equations since they are referenced in JMP help

Alpha level, subgroup size, and within subgroup sample sizes are the same for both charts.

Why would the decision limits be 2X larger on the fit Y by X generated ANOM chart?

Re: Measurement System Analysis Bias Comparison vs ANOM decision limits

Chris_Kirchberg — Tue, 11 Oct 2022 19:43:50 GMT

Hi @Josh1 ,

I think this might be one for support@jmp.com. IF they are using the same formulas, then something else is causing a ~0.00494 difference to the upper and lower decision limits.

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Measurement System Analysis Bias Comparison vs ANOM decision limits

Re: Measurement System Analysis Bias Comparison vs ANOM decision limits