If both charts are now in control, extend the control limits for ongoing monitoring. An important consideration in using X-bar/R charts is the selection of an appropriate subgroup or sample size.

When you are working with subgrouped data, it can be helpful to accompany a cusum chart for means with a Shewhart s chart for monitoring the variability of the process. This example creates this ...

Example 38.4: Creating a Chart with Revised Control Limits See SHWPEX4 in the SAS/QC Sample Library The following statements create a SAS data set named CIRC_ONE, which contains the number of failing ...

Changliang Zou, Peihua Qiu, Douglas Hawkins, NONPARAMETRIC CONTROL CHART FOR MONITORING PROFILES USING CHANGE POINT FORMULATION AND ADAPTIVE SMOOTHING, Statistica Sinica, Vol. 19, No. 3 (July 2009), .