How to resolve SPC p chart calculation issues is described in the linked-to article below. A traditional Statistical Process Control (SPC) p-Chart can lead to much firefighting in organizations.
How to Resolve SPC p chart Calculation Issues
P-charts are used in quality control to identify when special-cause or out-of-control conditions occur in time series data so that timely corrective actions can be taken to resolve problems. Sometimes data from a p-chart are used also to provide a process capability statement or non-conformance rate statement.
However, there can be application SPC p chart calculation issues that can lead to firefighting common cause variability as through it were special cause.
An approach to resolve this issue is the Integrated Enterprise Excellence (IEE) predictive performance methodology of 30,000-foot-level reporting.
More elaboration on this issue and resolution is provided in the article below.
Contact Us to set up a time to discuss with Forrest Breyfogle how your organization could gain much from IEE an enhancement to p chart reporting.