Using the randomisation om specifying the ANOVA model and table for properly and improperly replicated grazing trials
Date
1998
Authors
Brien, C.J.
Demetrio, C.
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Advisors
Journal Title
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Volume Title
Type:
Journal article
Citation
Animal Production Science, 1998; 38(4):325-334
Statement of Responsibility
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Abstract
<jats:p>
Summary. A method for deriving the analysis of variance
for an experiment is presented and applied to grazing trials. A special
feature of grazing trials, specifically utilised by our method, is that they
involve at least 2 randomisations: treatments are randomised to field units
(for example paddocks or plots), and field units are randomised to animals.
Randomisation results in the confounding (‘mixing up’) of terms
and our method includes separate terms in the analysis of variance table for
confounded terms so that all sources of variability in the experiment have
terms for them included in the table and the confounding between the sources
of variability in the experiment is explicitly displayed in the table. This
information is used in determining the valid error terms and we will present
examples that show how to ascertain these for effects of interest and hence
which effects can be tested. In this it fulfils the same role as the
contentious process of identifying the experimental unit.
It will be demonstrated that the inclusion of separate terms for confounded
terms results in improper replication in grazing trials being automatically
signalled, and makes its ramifications clear.</jats:p>