has part preceded by is about has_specified_input has_specified_output achieves_planned_objective has value data set population study design independent variable study design dependent variable data transformation ANOVA true true 1 2 1 1 ANOVA James Malone AGB and PRS augmented the class with formal definitions as part of STATO extension ANOVA or analysis of variance is a data transformation in which a statistical test of whether the means of several groups are all equal. Alejandra Gonzalez-Beltran Analysis of Variance Philippe Rocca-Serra stat.anova() normal distribution hypothesis false positive rate homoskedasticity hypothesis absence of between group difference hypothesis number of degrees of freedom Levene's test Barlett's test Brown Forsythe test Kolmogorov-Smirnov test F-test standardized mean difference confidence interval F-distribution residual continuous variable categorical variable between group comparison objective between group comparison statistical test p-value metadata incomplete pending final vetting obi.owl