The Anatomy of an XmR Chart

The XmR Chart is a variant of the Mean & Range Chart, which was discussed in the previous module of the course. It is used in situations where:

• a single item or step in the process must be assessed separately (e.g. times of trains, body temperature, etc.,)
• data volumes are low (e.g. 1 value per day)

The image below shows an example of a blank XmR Chart. Click on each of the labelled areas in the image for more information about that section of the chart.