Control Limit

by | Jan 31, 2020

The control limits are calculated from the data. In a Control Chart, they are displayed as horizontal lines. For normally distributed data, they are an estimation of 3 standard deviations using time order information: Upper Control Limit (UCL) = Mean + 3 Standard...

Process Capability

by | Jan 30, 2020

Process Capability compares how the process actually is (described by its mean and its standard deviation), compared to how it should be (described by its specification limits USL and LSL). Indices for Process Capability: Cp IndexCpk IndexPp IndexPpk Index...