Summary of Analysis Methods (ANOVA command)

The following table describes the results obtained with various combinations of methods for controlling the entry of covariates and decomposing the sums of squares.

Table 1. Combinations of COVARIATES and METHOD subcommands
Method Assessments between types of effects Assessments within the same type of effect
METHOD=UNIQUE Covariates, Factors, and Interactions simultaneously

Covariates: adjust for factors, interactions, and all other covariates

Factors: adjust for covariates, interactions, and all other factors

Interactions: adjust for covariates, factors, and all other interactions

METHOD=EXPERIMENTAL

Covariates

then

Factors

then

Interactions

Covariates: adjust for all other covariates

Factors: adjust for covariates and all other factors

Interactions: adjust for covariates, factors, and all other interactions of the same and lower orders

METHOD=HIERARCHICAL

Covariates

then

Factors

then

Interactions

Covariates: adjust for covariates that are preceding in the list

Factors: adjust for covariates and factors preceding in the list

Interactions: adjust for covariates, factors, and all other interactions of the same and lower orders

COVARIATES=WITH

and

METHOD=EXPERIMENTAL

Factors and Covariates concurrently

then

Interactions

Covariates: adjust for factors and all other covariates

Factors: adjust for covariates and all other factors

Interactions: adjust for covariates, factors, and all other interactions of the same and lower orders

COVARIATES=WITH

and

METHOD=HIERARCHICAL

Factors and Covariates concurrently

then

Interactions

Factors: adjust only for preceding factors

Covariates: adjust for factors and preceding covariates

Interactions: adjust for covariates, factors, and all other interactions of the same and lower orders

COVARIATES=AFTER

and

METHOD=EXPERIMENTAL

Factors

then

Covariates

then

Interactions

Factors: adjust for all other factors

Covariates: adjust for factors and all other covariates

Interactions: adjust for covariates, factors, and all other interactions of the same and lower orders

COVARIATES=AFTER

and

METHOD=HIERARCHICAL

Factors

then

Covariates

then

Interactions

Factors: adjust only for preceding factors

Covariates: adjust factors and preceding covariates

Interactions: adjust for covariates, factors, and all other interactions of the same and lower orders