> X-Authentication-Warning: lamb.chiswick.anprod.csiro.au: petidomo set sender
to asreml-owner@lamb.chiswick.anprod.csiro.au using -f
> Date: Mon, 05 Mar 2001 22:27:56 +1100
> To: asreml@chiswick.anprod.csiro.au
> From: Kim Bunter <kbunter@metz.une.edu.au>
> Subject: uninformative groups in 0/1 data
> Mime-Version: 1.0
>
> Hi Arthur (and all),
>
> could you indicate how ASREML deals with uninformative groups for 0/1
> traits?
ASREML does not do anything automatically other than trying to
estimate an effect on the boundary by limiting the magnnitude
of the fitted value. There is probably a better approach but I
have not become aware of it.
> Can uninformative groups accidentally "become informative"
> numerically through the fitting of covariates (for example),
NO they cannot be made informative unless the GROUP term is not fitted
(as a fixed effect)
> or are these
> groups removed before any other effects in the model are considered?
If they are casusing problems (which is likely), the user should
drop them.
>
> Also, are there any tricks to running bivariate analyses with one binary
> and one continuous trait? It seems trait order is important (ie 0/1 trait
> must be specified first).
INDEED
>Can either !log or !prob be used,
YES
> and does
> convergence usually need to be helped along with fixing some parameters
> (for example)?
>
Make sure the problem is not obverspecified and you have good
starting values. Whether fixing values will help will depend
more on the complexity of the model.
> Any comments much appreciated.
>
> Cheers
>
> Kim
> Kim Bunter
> Research Scientist
> Animal Genetics and Breeding Unit
> University of New England
> Armidale, NSW, 2351
> AUSTRALIA
>
> Ph (ISD): -61-2-67733788
> Fax (ISD): -61-2-67733266
> email: kbunter@metz.une.edu.au
> --
> Asreml mailinglist archive: http://www.chiswick.anprod.csiro.au/lists/asreml
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Arthur Gilmour PhD mailto:Arthur.Gilmour@agric.nsw.gov.au
Principal Research Scientist (Biometrics) fax: <61> 2 6391 3899
NSW Agriculture <61> 2 6391 3922
Orange Agricultural Institute telephone work: <61> 2 6391 3815
Forest Rd, ORANGE, 2800, AUSTRALIA home: <61> 2 6362 0046
Cargo: <61> 2 6364 3288
Until July 2001, I will be mainly building a house at Cargo.
ASREML is still free by anonymous ftp from pub/aar on ftp.res.bbsrc.ac.uk
or point your web browser at ftp://ftp.res.bbsrc.ac.uk/pub/aar/
To join the asreml discussion list, send the message
subscribe
mailto:asreml-request@chiswick.anprod.CSIRO.au
To send messages to the list, mailto:asreml@chiswick.anprod.CSIRO.au
Asreml list archive: http://www.chiswick.anprod.csiro.au/lists/asreml
<> <> <> <> <> <> <>
"Blessed are the peacemakers,
for they shall be called sons of God" Jesus; Matthew 5:9
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
--
Asreml mailinglist archive: http://www.chiswick.anprod.csiro.au/lists/asreml