出典:Wiktionary
出典:『Wiktionary』 (2024/10/31 19:16 UTC 版)
analysis of variance (countable and uncountable, plural analyses of variance)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/03 15:49 UTC 版)
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 its simplest form ANOVA provides a statistical test of whether or not the means of several groups are all equal, and therefore generalizes t-test to more than two groups. Doing multiple two-sample t-tests would result in an increased chance of committing a type I error. For this reason, ANOVAs are useful in comparing two, three or more means.