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Statistics - Social Sciences & Law | Two-Way Analysis of Variance

Two-Way Analysis of Variance

Statistical Tests and Graphics Using R

MacFarland, Thomas W.

2012, VII, 150p. 3 illus., 2 illus. in color.

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In statistics, analysis of variance (ANOVA) is a collection of statistical models used to distinguish between an observed variance in a particular variable and its component parts.  In its simplest form, ANOVA provides a statistical test of whether or not the means of several groups are all equal, and therefore generalizes a test between these groups. One test often used by statisticians and researchers in their work is the Two-Way ANOVA, which determines the differences--and possible interactions--when variables are presented from the perspective of two or more categories.  When a Two-Way ANOVA is implemented, it enables one to compare and contrast variables resulting from independent or joint actions. This brief provides guidance on how R can be used to facilitate Two-Way ANOVA for data analysis and graphical presentation.  Along with instruction on the use of R and R syntax associated with Two-Way ANOVA, this brief will also reinforce the use of descriptive statistics and graphical figures to complement outcomes from parametric Two-Way ANOVA. 

Content Level » Research

Keywords » Analysis of Variance - Density Plot - Multiple Comparisons - R Functions - Statistics

Related subjects » Social Sciences & Law - Statistical Theory and Methods - Statistics

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