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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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GLM: Univariate 659<br />

LOF Perform a lack-of-fit test (which requires at least one cell to have multiple<br />

observations). If the test is rejected, it implies that the current<br />

model cannot adequately account for the relationship between the response<br />

variable and the predictors. Either a variable is omitted or extra<br />

terms are needed in the model.<br />

OPOWER Observed power for each test. The observed power gives the probability<br />

that the F test would detect a population difference between<br />

groups equal to that implied by the sample difference.<br />

TEST(LMATRIX) Set of contrast coefficients (L) matrices. The transpose of the L matrix<br />

(L’) is displayed. This set always includes one matrix displaying the<br />

estimable function for each between-subjects effect appearing or<br />

implied in the DESIGN subcommand. Also, any L matrices generated<br />

by the LMATRIX or CONTRAST subcommands are displayed.<br />

TEST(ESTIMABLE) can be used in place of TEST(LMATRIX).<br />

Example<br />

GLM DEP BY A B WITH COV<br />

/PRINT=DESCRIPTIVE, TEST(LMATRIX), PARAMETER<br />

/DESIGN.<br />

• Since the design in the DESIGN subcommand is not specified, the default design is used.<br />

In this case, the design includes the intercept term, the covariate COV, and the full<br />

factorial terms of A and B, which are A, B, and A*B.<br />

• For each combination of levels of A and B, SPSS displays the descriptive statistics of DEP.<br />

• The set of L matrices that generates the sums of squares for testing each effect in the<br />

design is displayed.<br />

• The parameter estimates, their standard errors, t tests, confidence intervals, and the<br />

observed power for each test are displayed.<br />

PLOT Subcommand<br />

PLOT provides a variety of plots useful in checking the assumptions needed in the analysis.<br />

The PLOT subcommand can be specified more than once. All of the plots requested on each<br />

PLOT subcommand are produced.<br />

Use the following keywords on the PLOT subcommand to request plots:<br />

SPREADLEVEL Spread-versus-level plots. Plots of observed cell means versus standard<br />

deviations, and versus variances.<br />

RESIDUALS Observed by predicted by standardized residuals plot. A plot is produced for<br />

each dependent variable. In a univariate analysis, a plot is produced for the<br />

single dependent variable.<br />

PROFILE Line plots of dependent variable means for one-way, two-way, or three-way<br />

crossed factors. The PROFILE keyword must be followed by parentheses<br />

containing a list of one or more factor combinations. All factors specified<br />

(either individual or crossed) must be made up of only valid factors on the<br />

factor list. Factor combinations on the PROFILE keyword may use an asterisk

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