Talk:Levey–Jennings chart
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Try searching under "Levy-Jennings". The proper spelling does not have the extra "e".
- Actually, it DOES. It is used and written with an extra 'e' at our lab and in our literature (US and UK), though. Dr. F.C. Turner - [USERPAGE|USERTALK] - 13:12, 15 February 2010 (UTC)
removed comment[edit]
removed from article " Correction: The Levey-Jennings chart is NOT the same as the Shewhart Individuals chart. The Levey-Jennings chart uses the long-term (i.e., population) estimate of sigma whereas the Shewhart chart uses the short-term (i.e., within the rational subgroup) estimate. Dr. John Flaig". I slightly changed what was said in response, but something better is needed. Melcombe (talk) 13:32, 30 November 2009 (UTC)
Malcombe,
Changing the text to say they are "similar" helps a little, but leaves open the question of just how they are similar. I think it is better to say exactly how they differ as this leaves no confusion. Therefore, I would remove the current comment and replace it with:
The Levey-Jennings chart differs from the Shewhart Individuals control chart in the way sigma is estimated. The Levey-Jennings chart uses the long-term (i.e., population) estimate of sigma whereas the Shewhart chart uses the short-term (i.e., within the rational subgroup) estimate.
John 72.153.169.233 (talk) 21:41, 30 November 2009 (UTC)