Analysis of variance (ANOVA)

Analysis of variance (ANOVA)
In statistics, analysis of variance (ANOVA) is a collection of statistical models, and their associated procedures, in which the observed variance in a particular variable is partitioned into components attributable to different sources of variation.

In other words, 
Analysis of variance (ANOVA) is the process of partitioning and decomposing total variation contained in the data into various independent components, each of which is attributed to an identifiable cause or sources of variation and a further component due to chance factor.

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