[转贴]AIAG MSA FAQ List
1．What is the difference between "% contribution" and "% study" in
terms of GRR performance?
% Contribution is determined by multiplying by 100 the proportion of the GRR
variance to the total study variance. % Study is determined by multiplying by
100 the proportion of the GRR standard deviation to the total study standard
deviation. Thus, a level of 20% study is equivalent to a level of 4% contribution
(.2 x .2 = .04).
terms of GRR performance?
% Contribution is determined by multiplying by 100 the proportion of the GRR
variance to the total study variance. % Study is determined by multiplying by
100 the proportion of the GRR standard deviation to the total study standard
deviation. Thus, a level of 20% study is equivalent to a level of 4% contribution
(.2 x .2 = .04).
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beiquan (威望:11) (福建 厦门) 电子制造 员工
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than they used
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.