Hello Martin,
I have J.N.R. Jeffers, "Use of Range/Standard Deviation Tables", Forestry
1952 25(1):66-68 see
http://forestry.oxfordjournals.org/cgi/content/abstract/25/1/66
Note that Tippett was responsible for the tables.
The link to this article is "Tables of Range and Studentized Range" by H.
Leon Harter, Annals of Mathematical Statistics, v31, p.1122-1147, 1960
http://www.jstor.org/pss/2237810
Best Wishes,
Martin Holt
----- Original Message -----
From: "Martin Gibson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, November 19, 2009 11:32 AM
Subject: SPC query
Good morning AllStat,
Does anyone know who in the 1940s / 1950s whilst not challengeing
Shewhart's thinking on limits proved that R-bar from range data can be used
to calculate the standard deviation used in SPC charts please?
Many thanks,
Martin Gibson
|