Xbar And R Chart. The range (r) chart shows the variation within each variable (called subgroups). The control limits on both chats are used to monitor the mean and variation of the process going forward.
Click on sheet 1 (or press f4 to activate last worksheet). Commonly encountered control chart variants, and leverages two different views: Use this control chart to monitor process stability over time so that you can identify and correct instabilities in a process.