Introduction
Analysis of variance (ANOVA) is a procedure for assigning sample
variance to different sources and deciding whether the variation arises
within or among different population groups. Samples are described
in terms of variation around group means and variation of group means
around an overall mean. If variations within groups are small relative
to variations between groups, a difference in group means may be inferred. Hypothesis Tests are used to quantify
decisions.
This chapter treats ANOVA among groups, that is, among categorical
predictors. ANOVA for regression, with continuous predictors, is discussed
in Tabulating Diagnostic Statistics.
Multivariate analysis of variance (MANOVA), for data with multiple
measured responses, is also discussed in this chapter.
 | Analysis of Variance | | ANOVA |  |
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