Ever wondered how to compare group means (when you have more than two groups) and test if there is a difference between them? One way ANOVA does just that. You can compare group means between each other and avoid a Type I error you would get if you compared the groups pair-wise with a t-test. Each group can have only one factor, though (if you happen to have more factors, see two-way ANOVA, for example). To find out how to do ANOVA in R (freeware, downloadable from http://www.r-project.org/) see post @ SEDASM.
4 February, 2010
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