R help - Feb 2004 - rstandard does not produce standardized residuals

Dear all,


the application of the function rstandard() in the base package
 to a glm object does not produce  residuals standardized to 
have variance one:

the reason is that the deviance residuals are  divided
by the dispersion estimate and not by the
square root of the estimate for the dispersion.

Should the function not be changed to produce residuals
with a variance about 1?


R 1.8.1 on windows 2000

ulrich


=============================================================Ulrich Halekoh, 
PhD                         Phone: +45 8999 1825
Biometry Research Unit                       Fax:   +45 8999 1300
Danish Institute of Agricultural Sciences    E-mail: ulrich.halekoh at agrsci.dk
Research Centre Foulum, DK-8830 Tjele, Denmark

This has laready been changed in the R-devel version (1.9.0 to be).
Pre-test versions of that for Windows are available on CRAN.
>From the NEWS file

    o	rstandard() was wrongly scaled for cases where
	summary(model)$dispersion != 1.

and that ought to mention glm somewhere ....


On Tue, 24 Feb 2004, Ulrich Halekoh wrote:
> Dear all,
>
>
> the application of the function rstandard() in the base package
>  to a glm object does not produce  residuals standardized to
> have variance one:
>
> the reason is that the deviance residuals are  divided
> by the dispersion estimate and not by the
> square root of the estimate for the dispersion.
>
> Should the function not be changed to produce residuals
> with a variance about 1?
>
>
> R 1.8.1 on windows 2000
>
> ulrich
>
>
> =============================================================> Ulrich
Halekoh,  PhD                         Phone: +45 8999 1825
> Biometry Research Unit                       Fax:   +45 8999 1300
> Danish Institute of Agricultural Sciences    E-mail: ulrich.halekoh at
agrsci.dk
> Research Centre Foulum, DK-8830 Tjele, Denmark
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
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