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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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130 ANOVA<br />

COVARIATES Subcommand<br />

COVARIATES specifies the order for assessing blocks of covariates and factor main effects.<br />

• The order of entry is irrelevant when METHOD=UNIQUE.<br />

FIRST Process covariates before factor main effects. This is the default.<br />

WITH Process covariates concurrently with factor main effects.<br />

AFTER Process covariates after factor main effects.<br />

MAXORDERS Subcommand<br />

MAXORDERS suppresses the effects of various orders of interaction.<br />

ALL Examine all interaction effects up to and including the fifth order. This is the default.<br />

n Examine all interaction effects up to and including the nth order. For example,<br />

MAXORDERS=3 examines all interaction effects up to and including the third order.<br />

All higher-order interaction sums of squares are pooled into the error term.<br />

NONE Delete all interaction terms from the model. All interaction sums of squares are<br />

pooled into the error sum of squares. Only main and covariate effects appear in the<br />

ANOVA table.<br />

METHOD Subcommand<br />

METHOD controls the method for decomposing sums of squares.<br />

UNIQUE Regression approach. UNIQUE overrides any keywords on the COVARIATES<br />

subcommand. All effects are assessed simultaneously for their partial contribution.<br />

The MCA and MEAN specifications on the STATISTICS subcommand<br />

are not available with the regression approach. This is the default if METHOD<br />

is omitted.<br />

EXPERIMENTAL Classic experimental approach. Covariates, main effects, and ascending<br />

orders of interaction are assessed separately in that order.<br />

HIERARCHICAL Hierarchical approach.<br />

Regression Approach<br />

All effects are assessed simultaneously, with each effect adjusted for all other effects in<br />

the model. This is the default when the METHOD subcommand is omitted. Since MCA<br />

tables cannot be produced when the regression approach is used, specifying MCA or ALL<br />

on STATISTICS with the default method triggers a warning.

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