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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