Re: contrasts in ASREML

From: Holland, Jim <Jim.Holland_at_ARS.USDA.GOV>
Date: Wed, 2 Sep 2009 18:30:11 -0400

I also have this same exact problem with my data and programs. It seems
like the estimated effects are half of what they should be, something is
unclear with the explanation of how to code the !CONTRAST function in
the manual. - Jim



From: ASReml users discussion group [mailto:ASREML-L_at_DPI.NSW.GOV.AU] On
Behalf Of Ducro, Bart
Sent: Wednesday, September 02, 2009 4:00 AM
Subject: contrasts in ASREML


Dear Arthur and others,

We have a question about the estimation of contrasts. If you look at the
solutions of the fixed effects (in the .sln file) from a mixed model
analysis, we get the following results:

code estimate s.e.

99 0.000 0.00

10 0.385 0.227

11 0.764 0.207

12 0.975 0.226


Based on these solutions we would expect the following contrasts between
classes 10 and 12 of about -0.59

If we estimate the contrast using !CONTRAST we get -0.297 (with s.e. of

Do we overlook something?

Thanks in Advance,

Henk Bovenhuis and Bart Ducro

Wageningen University

The Netherlands


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Received on Thu Sep 02 2009 - 18:30:11 EST

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