Analysis of trials with complex treatment structure using multiple contrast tests

verfasst von: Frank Schaarschmidt, Lea Vaas
Abstract: Experiments with complex treatment structures are not uncommon in horticultural research. For example, in augmented factorial designs, one control treatment is added to a full factorial arrangement, or an experiment might be arranged as a two-factorial design with some groups omitted because they are practically not of interest. Several statistical procedures have been proposed to analyze such designs. Suitable linear models followed by F-tests provide only global inference for main effects and their interactions. Orthogonal contrasts are demanding to formulate and cannot always reflect all experimental questions underlying the design. Finally, simple mean comparisons following global F-tests do not control the overall error rate of the experiment in the strong sense. In this article, we show how multiple contrast tests can be used as a tool to address the experimental questions underlying complex designs while preserving the overall error rate of the conclusions. Using simultaneous confidence intervals allows for displaying the direction, magnitude, and relevance of the mean comparisons of interest. Along with application in statistical software, shown by two examples, we discuss the possibilities and limitations of the proposed approach.
Organisationseinheit(en): Abteilung Biostatistik
Typ: Artikel
Journal: HortScience
Band: 44
Seiten: 188-195
Anzahl der Seiten: 8
ISSN: 0018-5345
Publikationsdatum: 02.2009
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Gartenbau
Elektronische Version(en): https://doi.org/10.21273/hortsci.44.1.188 (Zugang: Offen)

BibTeX

@article{f1c739d2c9794742b5c6ee5a4290990f,
title = "Analysis of trials with complex treatment structure using multiple contrast tests",
abstract = "Experiments with complex treatment structures are not uncommon in horticultural research. For example, in augmented factorial designs, one control treatment is added to a full factorial arrangement, or an experiment might be arranged as a two-factorial design with some groups omitted because they are practically not of interest. Several statistical procedures have been proposed to analyze such designs. Suitable linear models followed by F-tests provide only global inference for main effects and their interactions. Orthogonal contrasts are demanding to formulate and cannot always reflect all experimental questions underlying the design. Finally, simple mean comparisons following global F-tests do not control the overall error rate of the experiment in the strong sense. In this article, we show how multiple contrast tests can be used as a tool to address the experimental questions underlying complex designs while preserving the overall error rate of the conclusions. Using simultaneous confidence intervals allows for displaying the direction, magnitude, and relevance of the mean comparisons of interest. Along with application in statistical software, shown by two examples, we discuss the possibilities and limitations of the proposed approach.",
keywords = "Augmented factorial, Fixed-dose combination, Linear model, Multiple comparisons, Simultaneous confidence intervals",
author = "Frank Schaarschmidt and Lea Vaas",
year = "2009",
month = feb,
doi = "10.21273/hortsci.44.1.188",
language = "English",
volume = "44",
pages = "188--195",
journal = "HortScience",
issn = "0018-5345",
publisher = "American Society for Horticultural Science",
number = "1",
}