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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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1642 VARCOMP<br />

Nesting within an interaction effect is valid. For example, A(B*C) means that factor<br />

A is nested within B*C while X(A*B) means covariate X is nested within A*B.<br />

Interactions among nested effects are allowed. For example, A*B(C) means<br />

interaction between A and B within levels of C. X*Y(A) means the product of<br />

X and Y nested within levels of C. The expression A(C)*B(C) is invalid.<br />

Example<br />

VARCOM Y BY DRUG SUBJECT WITH X<br />

/RANDOM = SUBJECT<br />

/DESIGN = DRUG SUBJECT DRUG*SUBJECT X*SUBECT.<br />

• The DESIGN subcommand specifies two main effects and two interaction terms.<br />

• All effects that involve the factor SUBJECT are assumed to be random.

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