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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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1074 NOMREG<br />

SCALE Subcommand<br />

The SCALE subcommand specifies the dispersion scaling value. Model estimation is not<br />

affected by this scaling value. Only the asymptotic covariance matrix of the parameter estimates<br />

is affected.<br />

N A positive number corresponding to the amount of overdispersion or<br />

underdispersion. The default scaling value is 1, which corresponds to<br />

no overdispersion or underdispersion.<br />

DEVIANCE Estimates the scaling value by using the deviance function statistic.<br />

PEARSON Estimates the scaling value by using the Pearson chi-square statistic.<br />

SUBPOP Subcommand<br />

The SUBPOP subcommand allows you to define the subpopulation classification used in<br />

computing the goodness-of-fit statistics.<br />

• A variable list is expected if the SUBPOP subcommand is specified. The variables in the list<br />

must be a subset of the combined list of factors and covariates specified on the command<br />

line.<br />

• Variables specified or implied on the MODEL subcommand must be a subset of the variables<br />

specified or implied on the SUBPOP subcommand.<br />

• If the SUBPOP subcommand is omitted, the default classification is based on all of the<br />

factors and the covariates specified.<br />

• Missing values are deleted listwise on the subpopulation level.<br />

Example<br />

NOMREG<br />

movie BY gender date WITH age<br />

/CRITERIA = CIN(95) DELTA(0) MXITER(100) MXSTEP(5) LCONVERGE(0)<br />

PCONVERGE(1.0E-6) SINGULAR(1.0E-8)<br />

/MODEL = gender<br />

/SUBPOP = gender date<br />

/INTERCEPT = EXCLUDE .<br />

• Though the model only consists of gender, the SUBPOP subcommand specifies that<br />

goodness-of-fit statistics should be computed based on both gender and date.<br />

TEST Subcommand<br />

The TEST subcommand allows you to customize your hypothesis tests by directly specifying<br />

null hypotheses as linear combinations of parameters.<br />

• TEST is offered only through syntax.<br />

• Multiple TEST subcommands are allowed. Each is handled independently.

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