What Is Analysis of Variance ANOVA

ANOYA does not require the effects to be independent, but the data do need to be normally distributed. 

In this chapter we briefly show how an ANOVA is performed for the simplest case of a single factor (so-called one-way ANOVA) and then for a two-way ANOVA. ANOVA is available (albeit in a restricted form) in Excel, and in most other statistical packages. Although we shall show you how to do a one-way ANOVA by hand, the chapter will concentrate on the interpretation of ANOVA output from software applications. 

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