Calculations for the specification limits for Calculate Gap Pools

LSL

Element lower specification limits

If not specified, Minitab calculates using long-term element Z.Bench and long-term element standard deviation as shown.

Nominal

Element nominal values

If not specified, Minitab uses the mean.

Nominal = Ti

USL

Element upper specification limits

If not specified, Minitab calculates using long-term element Z.Bench and long-term element standard deviation as shown.

Z.LSLi

Long-term Z score of the element lower specification

Z.USLi

Long-term Z score of the element upper specification

PPM.LSLi

Defects parts per million associated with the lower specification

PPM.LSLi = Φ(–Z.LSL) * 106

PPM.USLi

Defects parts per million associated with the upper specification

PPM.USLi = Φ(–Z.USL) * 106

PPM.Totali

Defects parts per million associated with the specification limits

PPM.Totali = PPM.LSLi + PPM.USLi

%Y.FTi

First time yield in percentage of the ith element

DPUi

Defects per unit

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