What Sigma is used in SPC CHART is that 6 Sigma or 4 sigma.We need to use only 6 sigma for CP,CPK.can you tell us what sigma is used in QCSPCCHART.How to change the Sigma is there any option to change to 6 or 4 Sigma
The formuals for the SPC control chart limits are found starting on page 150 in the QCSPCChartNetManual. The formulas for the Process Capability indices are found starting 134. The default sigma limits are +=3 sigma.
SPC Chart,CP,CPK What Sigma
Posted - 07 Sep 2008 : 22:56:17
