What Are X-Bar and R Charts? The control chart was developed by Dr. Walter A. Shewhart, an American physicist, engineer, and statistician, who is sometimes referred to as the father of statistical ...

Although cusum charts and Shewhart charts are both used to detect shifts in the process mean, there are important differences in the two methods. Each point on a Shewhart chart is based on information ...

Although the SHEWHART procedure provides a large number of options, you can use the procedure to create a basic Shewhart chart with as few as two SAS statements: the PROC SHEWHART statement, which ...