[R] Royston's V' and v' functions

From: Ralph Henderson <caralph_at_sympatico.ca>
Date: Tue 30 Aug 2005 - 22:31:31 EST


Dear R-list readers:

Royston described the effect of sample size on the p-value obtained from the Shapiro-Francia test (Estimating departure from normality. Stat Med 1991;10:1283-93). He developed two indices from the Shapiro-Francia test (i) V' - an index of departure from normality and (ii) v' - a plot of the cumulative squared residuals.

He mentioned the availability (in 1991) of a Minitab macro and a Stata program for calculating V' and producing v' plots. Unfortunately he no longer has these scripts in his computer. Therefore I wondered if any reader of this list possessed R (or indeed S) versions of Royston's routines?

I have, of course, done the usual searches but only obtain references to Royston's own modifications of the Shapiro-Francia test itself or to other users of that test. Any help or advice would be gratefully received. Thank you.

Ralph Henderson (ahenders@uwo.ca)
Department of Biochemistry
University of Western Ontario
London, Ontario, Canada

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