I am planning a 2x2 factorial experiment whe
Dear list members,
I am planning a 2x2 factorial experiment where I record several response
variables to test several hypotheses.
Some of these hypotheses can be tested using the usual 2-way ANOVA. That is,
the
significance or non significance of
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Dear Colleagues,
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Dear Colleagues,
It is my pleasure to announce the official launch of a new climate change
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Orthogonal sets of a priori contrasts do not require adjustment of p-values
because they ARE simply components of the ANOVA. That is why they are so
powerful for hypothesis testing. They are also greatly under utilized.
William J. Resetarits
Program Director
Population and Community Ecology
There should be no problem with using a priori contrasts. No
adjustment of the p-value is required, UNLESS the contrasts are
non-orthogonal, which is often the case when more than two hypothesis
tests. If the contrasts are not orthogonal, some type of adjustment
(e.g. Bonferroni) is
