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Why are the K1, K2, K3 factors for doing a GRR so much different now than they used to be?

April 26, 2017different doing factors GRR K1 k2 K3 Used

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Why are the K1, K2, K3 factors for doing a GRR so much different now than they used to be?

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The K factors used in the original MSA1 and MSA2 manuals included a 5.15 sigma multiplier that cancelled out of the final results. Since that multiplier essentially had no impact on the final results, it was decided to eliminate its presence in the formulas.