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Distance Inside Spec
The distance inside spec is the amount that the interval for values is from the specification limits. Its formula is
where USL is the upper specification limit, LSL is the lower specification limit, UT is the upper end of the interval for values and LT is the lower end of the interval for values. If only one specification limit exists, calculate only that part of the equation and omit the minimum. A negative value means that the interval for individual values is outside the specification limits.