Contents
- Index
Statistical Tolerance
A statistical tolerance is a tolerance that specifies requirements for the process variation while assuming a centered process. A statistical tolerance is determined by its target, standard deviation and distribution. A statistical tolerance is a special case of a process tolerance with no operating window, i.e., minimum average = maximum average = target.
Statistical tolerancing is more cost effective when compared to worst-case tolerances , as it allows one to open up the tolerances on the inputs. However, it introduces a questionable assumption that the process remains centered. Violation of this assumption can lead to quality issues.