Key Points X-bar and R charts are useful control charts for use with rational subgroups. X-bar measure between-sample variation. R charts measure within-sample variation. All processes vary.

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 ...

An Industry Example In the above example, a process improvement event addressing expense report non-conformances was held in April 2020. The major failure categories were then tracked for one year.

This example shows how to control the format of the Gantt chart using CHART statement options. The Schedule data set used by PROC GANTT is the same as that used in . The output is on four pages; the ...

Peihua Qiu, Changliang Zou, CONTROL CHART FOR MONITORING NONPARAMETRIC PROFILES WITH ARBITRARY DESIGN, Statistica Sinica, Vol. 20, No. 4 (October 2010), pp. 1655-1682 ...