Contributions
Percent contributions combine the sensitivity information with the part dimension variation information to show how much of the measurement variation is caused by each part dimension. The percent contribution of a dimension depends on the analysis type.
Statistical Contributions
The first-order statistical percent contribution formula is:
where
= I
th part dimension in stackup
= measurement
= standard deviation of
= standard deviation of
Worst-case Contributions
The first-order worst-case percent contribution formula is:
Where,
= I
th part dimension in stackup
= measurement
= upper tolerance limit of
= lower tolerance limit of
= upper tolerance limit of
= lower tolerance limit of
