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The New Statistics with RAn Introduction for Biologists$
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Andy Hector

Print publication date: 2015

Print ISBN-13: 9780198729051

Published to Oxford Scholarship Online: March 2015

DOI: 10.1093/acprof:oso/9780198729051.001.0001

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Interactions

Interactions

Chapter:
(p.83) 6 Interactions
Source:
The New Statistics with R
Author(s):

Andy Hector

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198729051.003.0006

This chapter moves on from simple ‘one-way’ designs to more complex factorial designs. It extends the simple linear model to include interactions as well as average main effects. Interactions are assessed relative to a null additive expectation where the treatments have no effect on each other. Interactions can be positive when effects are more than additive or negative when they are less than expected. It considers in detail the analysis of an example data set concerning the mechanisms of loss of plant diversity following fertilizer treatment.

Keywords:   factorial designs, interactions, main effects, null expectation, additive predictions

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