Control Chart Suggestion

Individuals And Moving Range – X and R_m

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 R_m or XmR Chart.

Control Chart Formulae

Table of Constants

Control Chart Example

Additional Resources

• Individuals Control Charts
• Steps In Constructing an Individuals and Moving Range Control Chart
• Steps in Constructing an Exponentially Weighted Moving Average (EWMA) Chart
• Additional Control Chart Links

References

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