Hierarchical Approach (ANOVA command)

The hierarchical approach differs from the classic experimental approach only in the way it handles covariate and factor main effects. In the hierarchical approach, factor main effects and covariate effects are assessed hierarchically—factor main effects are adjusted only for the factor main effects already assessed, and covariate effects are adjusted only for the covariates already assessed. (See Table 1.) The order in which factors are listed on the ANOVA command determines the order in which they are assessed.