Control Chart Suggestion

p-Chart

Control Chart Description

Control charts dealing with the proportion or fraction of defective product are called p charts (for proportion). There is a difference between a defect and defective, as there is between a nonconformity and nonconforming unit. The p-chart control chart is used with discrete/attribute defective data when the sample size is greater than 50. The sample size may vary.

Control Chart Formulae

Control Chart Example

Additional Resources

• Proportions Control Charts
• Steps in Constructing a p-Chart
• Additional Control Chart Links

References

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