Control Chart Suggestion

Individuals And Moving Range – X and Rm

Control Chart Description

Control charts for individual measurements (e.g., the sample size = 1) use the moving range of two successive observations to measure the process variability. The combination of the X Chart for Individuals and the Moving Range chart is often called an X and Rm or XmR Chart.

Control Chart Formulae

Individuals and Moving Range Control Chart Formulae

Table of Constants

Control Chart Example

Individuals and Moving Range Control Chart Example

Additional Resources


Wheeler, D.J., & Chambers, D.S. (1992). Understanding Statistical Process Control. Knoxville, TN: SPC Press.

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