I have J.N.R. Jeffers, "Use of Range/Standard Deviation Tables", Forestry
1952 25(1):66-68 see
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
----- 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?