The USL is the highest value a process can hit while still meeting customer needs. Specification limits aren’t control limits, but rather something specified before production starts. You can see ...

You can save the control limits for and R charts in a SAS data set; this enables you to apply the control limits to future data (see "Reading Preestablished Control ...

Control charts have been widely used for monitoring production processes and identifying assignable causes of variability. Many papers investigate the application of control charts in different ...

You can save the control limits for a box chart in a SAS data set; this enables you to apply the control limits to future data (see "Reading Preestablished Control ...