ABSTRACT
Statistical tolerance analysis determines the probable or likely maximum variation possible for a selected dimension. Similar to worst-case tolerance analysis, all tolerances and other variables are added to obtain the total variation. This method, however, more realistically assumes that it is highly improbable that all the dimensions in the tolerance stackup will be at their worst-case low limit or high limit at the same time. Remember, the worst-case tolerance stackup result requires some dimensions to be at their low limit and others to be at their high limit. So the direction of the deviation as well as the amount of deviation must be just so to achieve a worst-case condition.
