Walter Shewhart, a physicist at Bell Laboratories, first wrote about control limits in 1924. He developed control charts to ...

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 ...

Shewhart charts are broadly classified according to the type of data analyzed. Shewhart charts for variables are used when the quality characteristic of a process is measured on a continuous scale.