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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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Analysis of Covariance: ANCOVA

Analysis of Covariance: ANCOVA

(p.101) 7 Analysis of Covariance: ANCOVA
The New Statistics with R

Andy Hector

Oxford University Press

ANCOVA of designed experiments combines one categorical and one continuous explanatory variable. Panel plots are usually the best way to graphically display ANCOVA designs with a separate linear regression within each level of the factor. The ANCOVA can test for effects of both variables and interactions between them. The chapter focuses on ANCOVA of designed experiments. Detailed analysis is given of subset of the variables from an experimental study of the effects of low-level atmospheric pollutants and drought on agricultural yields.

Keywords:   analysis of covariance, ANCOVA, covariate, categorical variable, continuous variable, linear regression

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