RE: R-Bar/d2

["Bill Woodall" <bwoodall@vt.edu>]

Hello Everyone...........

The calculation and use of d2 goes at least as far back as 

Patnaik, P.B. (1950), "The Use of Mean Range as an Estimator of Variance in
Statistical Tests", Biometrika, 37, pp 78-87.

Some additional information is given in the following paper, which I will be
glad to send to anyone that requests it.  I just need your mailing address.

Woodall, W. H., and Montgomery, D. C.  (2000), "Using Ranges to Estimate
Variability," Quality Engineering, 13(2), 211-217.

Thanks,

Bill Woodall