Excellent Scott. It is rare these days to read an article on control charts (Shewhart charts or Process Behavior Charts) that gets it right. It is sad to see your paper posted under the "Six Sigma" heading. I have never seen a Six Sigma believer get control charts right. Products such as Minitab that are commonly peddled in conjunction with Six Sigma, make it worse, with nonsense such as the claimed need for normal data. The only reason for normalization is to sell more outrageously expensive and unnecessary software.
If you want software to draw control charts, use FREE software like Maxi-Q. It adheres to Dr Shewhart and Dr Wheeler's teaching. The best approach is often to draw charts by hand, to get a feel for the data.
Once again, well done. I hope lots of folk read and learn.
Excellent Scott. It is rare these days to read an article on control charts (Shewhart charts or Process Behavior Charts) that gets it right. It is sad to see your paper posted under the "Six Sigma" heading. I have never seen a Six Sigma believer get control charts right. Products such as Minitab that are commonly peddled in conjunction with Six Sigma, make it worse, with nonsense such as the claimed need for normal data. The only reason for normalization is to sell more outrageously expensive and unnecessary software.
If you want software to draw control charts, use FREE software like Maxi-Q. It adheres to Dr Shewhart and Dr Wheeler's teaching. The best approach is often to draw charts by hand, to get a feel for the data.
Once again, well done. I hope lots of folk read and learn.