Inman, Brant A. M.D. wrote:
> R-Experts:
>
> Does anyone know if there are R functions to perform the Freeman-Tukey
> double arcsine transformation and then backtransform it?
>
>
Well, if not, both are given by explicit formulas, so it shouldn't take
long to implement, cf.:
The Teacher's Corner
*The Inverse of the Freeman-Tukey Double Arcsine Transformation
<http://www.jstor.org/view/00031305/di020556/02p0095b/0?frame=noframe&dpi=3&[EMAIL
PROTECTED]/01cce4405c00501bb027f&backcontext=page&backurl=/cgi-bin/jstor/viewitem/00031305/di020556/02p0095b/[EMAIL
PROTECTED]/01cce4405c00501bb027f%26config%3d%26PAGE%3d0&config=jstor&PAGE=0>*
John J. Miller
/The American Statistician/, Vol. 32, No. 4. (Nov., 1978),
p. 138.
Stable URL:
http://links.jstor.org/sici?sici=0003-1305%28197811%2932%3A4%3C138%3ATIOTFD%3E2.0.CO%3B2-Z
Abstract
A formula for the inverse of the Freeman-Tukey double arcsine
transformation is derived. This formula is useful when
expressing means of double arcsines as retransformed
proportions. When the mean is taken from original proportions
involving different n's, it is suggested that the harmonic mean
of the n's be used in the inversion formula.
> Thanks,
>
> Brant Inman
> Mayo Clinic
>
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