EAN: 9781461421337

TWO-WAY ANALYSIS OF VARIANCE - THOMAS W MACFARL...

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.

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