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GFD: An R Package for the Analysis of General Factorial Designs

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  • Friedrich, Sarah
  • Konietschke, Frank
  • Pauly, Markus

Abstract

Factorial designs are widely used tools for modeling statistical experiments in all kinds of disciplines, e.g., biology, psychology, econometrics and medicine. For testing null hypotheses in this framework, ANOVA methods are widely used. However, the corresponding F tests are only valid for normally distributed data with equal variances, two assumptions which are often not met in practice. The R package GFD provides an implementation of the Wald-type statistic (WTS), the ANOVA-type statistic (ATS) and a studentized permutation version of the WTS. Both the WTS and the permuted WTS do not require normally distributed data or variance homogeneity, whereas the ATS assumes normality. All methods are available for general crossed or nested designs and all main and interaction effects can be plotted. Additionally, the package is equipped with an optional graphical user interface to facilitate application for a wide range of users. We illustrate the implemented methods for a range of different designs.

Suggested Citation

  • Friedrich, Sarah & Konietschke, Frank & Pauly, Markus, 2017. "GFD: An R Package for the Analysis of General Factorial Designs," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 79(c01).
    • Handle: RePEc:jss:jstsof:v:079:c01
    DOI: http://hdl.handle.net/10.18637/jss.v079.c01
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    References listed on IDEAS

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    1. Lawrence, Michael & Temple Lang, Duncan, 2010. "RGtk2: A Graphical User Interface Toolkit for R," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 37(i08).
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    Cited by:

    1. Marc Ditzhaus & Roland Fried & Markus Pauly, 2021. "QANOVA: quantile-based permutation methods for general factorial designs," TEST: An Official Journal of the Spanish Society of Statistics and Operations Research, Springer;Sociedad de Estadística e Investigación Operativa, vol. 30(4), pages 960-979, December.

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