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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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Limitations<br />

MANOVA: Multivariate 871<br />

• If you enter one of the multivariate specifications in a univariate analysis, MANOVA<br />

ignores it.<br />

• Maximum 20 factors.<br />

• Memory requirements depend primarily on the number of cells in the design. For the<br />

default full factorial model, this equals the product of the number of levels or categories<br />

in each factor.<br />

MANOVA Variable List<br />

• Multivariate MANOVA calculates statistical tests that are valid for analyses of dependent<br />

variables that are correlated with one another. The dependent variables must be specified<br />

first.<br />

• The factor and covariate lists follow the same rules as in univariate analyses.<br />

• If the dependent variables are uncorrelated, the univariate significance tests have greater<br />

statistical power.<br />

TRANSFORM Subcommand<br />

TRANSFORM performs linear transformations of some or all of the continuous variables (dependent<br />

variables and covariates). Specifications on TRANSFORM include an optional list of<br />

variables to be transformed, optional keywords to describe how to generate a transformation<br />

matrix from the specified contrasts, and a required keyword specifying the transformation<br />

contrasts.<br />

• Transformations apply to all subsequent designs unless replaced by another TRANSFORM<br />

subcommand.<br />

• TRANSFORM subcommands are not cumulative. Only the transformation specified most<br />

recently is in effect at any time. You can restore the original variables in later designs by<br />

specifying SPECIAL with an identity matrix.<br />

• You should not use TRANSFORM when you use the WSFACTORS subcommand to request<br />

repeated measures analysis; a transformation is automatically performed in repeated<br />

measures analysis (see MANOVA: Repeated Measures).<br />

• Transformations are in effect for the duration of the MANOVA procedure only. After the<br />

procedure is complete, the original variables remain in the working data file.<br />

• By default, the transformation matrix is not displayed. Specify the keyword TRANSFORM<br />

on the PRINT subcommand to see the matrix generated by the TRANSFORM subcommand.<br />

• If you do not use the RENAME subcommand with TRANSFORM, the variables specified on<br />

TRANSFORM are renamed temporarily (for the duration of the procedure) as T1, T2, etc.<br />

Explicit use of RENAME is recommended.<br />

• Subsequent references to transformed variables should use the new names. The only<br />

exception is when you supply a VARIABLES specification on the OMEANS subcommand

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