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Version 2.0 Date 2010-11-04 Title Graphical Analysis of Variance

By James E. Helmreich and Maintainer James E. Helmreich

Abstract

Description This small collection of functions provides what we call elemental graphics for display of anova results. The term elemental derives from the fact that each function is aimed at construction of graphical displays that afford direct visualizations of data with respect to the fundamental questions that drive the particular anova methods. The two main functions are granova.1w (a graphic for one way anova) and granova.2w (a corresponding graphic for two way anova). These functions were written to display data for any number of groups, regardless of their sizes (however, very large data sets or numbers of groups can be problematic). For these two functions a specialized approach is used to construct data-based contrast vectors for which anova data are displayed. The result is that the graphics use straight lines, and when appropriate flat surfaces, to facilitate clear interpretation

Year: 2010
OAI identifier: oai:CiteSeerX.psu:10.1.1.192.582
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