ENBIS-11 in Coimbra

4 – 8 September 2011 Abstract submission: 1 January – 25 June 2011

Using DOE with Tolerance Intervals to Verify Specifications

5 September 2011, 11:50 – 12:10


Submitted by
Pat Whitcomb
Pat Whitcomb Shari Kraber
Stat-Ease, Inc., 2021 E. Hennepin Ave Suite 480 Minneapolis, MN 55413
Design of experiments followed by numeric and graphical optimization can be used to find a ‘sweet spot’; i.e. an operating window. To ensure specifications are consistently met, uncertainty (variability) must be accounted for when defining boundaries of the operating window. We present a method of accounting for uncertainty using tolerance intervals. In general, larger sample sizes (DOEs) are required to control the width of tolerance intervals as compared to confidence intervals that are typically used to size designs. A two-factor tableting process is used to illustrate building and sizing a design to control the width of the tolerance intervals associated with specifications.
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