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Control charts, also known as Shewhart charts (after Walter A. Shewhart) or process-behavior charts, in statistical process control are tools used to determine if a manufacturing or business process is in a state of statistical control. You can read more about control charts at Wikipedia (

Control charts are widely used in healthcare. A simple example of a time series chart using an upper and lower bound for a control range is shown below. The sample control chart is modeled after a control chart found in the the JAMA article “Association Between Quality Improvement for Care Transitions in Communities and Rehospitalizations Among Medicare Beneficiaries” (link: It models a graph in “Figure 1. Process Control Charts for 30-Day All-Cause Rehospitalizations per 1000 Medicare Beneficiaries per Quarter, 2006-2010” which can be seen below

Control Chart for Hospital Readmissions
Rehospitalizations Control Chart

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