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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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Subcommand Order<br />

• The list of dependent variables, factors, and covariates must be first.<br />

<strong>Syntax</strong> Rules<br />

GLM: Repeated Measures 679<br />

• The WSFACTOR (within-subjects factors), WSDESIGN (within-subjects design), and<br />

MEASURE subcommands are used only in repeated measures analysis.<br />

• WSFACTOR is required for any repeated measures analysis.<br />

• If WSDESIGN is not specified, a full factorial within-subjects design consisting of all main<br />

effects and all interactions among within-subjects factors is used by default.<br />

• The MEASURE subcommand is used for doubly multivariate designs, in which the dependent<br />

variables represent repeated measurements of more than one variable.<br />

Limitations<br />

Example<br />

• Any number of factors can be specified, but if the number of between-subjects factors<br />

plus the number of split variables exceeds 18, the Descriptive Statistics table is not printed<br />

even when you request it.<br />

• Maximum 18 within-subjects 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 />

GLM Y1 TO Y4 BY GROUP<br />

/WSFACTOR=YEAR 4 POLYNOMIAL<br />

/WSDESIGN=YEAR<br />

/PRINT=PARAMETER<br />

/DESIGN=GROUP.<br />

• WSFACTOR specifies a repeated measures analysis in which the four dependent variables<br />

represent a single variable measured at four levels of the within-subjects factor. The withinsubjects<br />

factor is called YEAR for the duration of the GLM procedure.<br />

• POLYNOMIAL requests polynomial contrasts for the levels of YEAR. Because the four variables,<br />

Y1, Y2, Y3, and Y4, in the working data file represent the four levels of YEAR, the<br />

effect is to perform an orthonormal polynomial transformation of these variables.<br />

• PRINT requests that the parameter estimates be displayed.<br />

• WSDESIGN specifies a within-subjects design that includes only the effect of the YEAR<br />

within-subjects factor. Because YEAR is the only within-subjects factor specified, this is<br />

the default design, and WSDESIGN could have been omitted.<br />

• DESIGN specifies a between-subjects design that includes only the effect of the GROUP<br />

between-subjects factor. This subcommand could have been omitted.

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