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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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• The FULLFACTORIAL subcommand does not take any keywords.<br />

INTERCEPT Subcommand<br />

NOMREG 1067<br />

The INTERCEPT subcommand controls whether intercept terms are included in the model.<br />

The number of intercept terms is the number of response categories less one.<br />

INCLUDE Includes the intercept terms. This is the default.<br />

EXCLUDE Excludes the intercept terms.<br />

MISSING Subcommand<br />

By default, cases with missing values for any of the variables on the NOMREG variable list<br />

are excluded from the analysis. The MISSING subcommand allows you to include cases with<br />

user-missing values.<br />

• Note that missing values are deleted at the subpopulation level.<br />

EXCLUDE Excludes both user-missing and system-missing values. This is the<br />

default.<br />

INCLUDE User-missing values are treated as valid. System-missing values<br />

cannot be included in the analysis.<br />

MODEL Subcommand<br />

The MODEL subcommand specifies the effects in the model.<br />

• The MODEL and the FULLFACTORIAL subcommands are mutually exclusive. Only one of<br />

them can be specified at any time.<br />

• If more than one MODEL subcommand is specified, only the last one is in effect.<br />

• Specify a list of terms to be included in the model, separated by commas or spaces. If the<br />

MODEL subcommand is omitted or empty, the default model is generated. The default<br />

model contains: first, the intercept (if included); second, all of the covariates (if specified),<br />

in the order in which they are specified; and next, all of the main factorial effects,<br />

in the order in which they are specified.<br />

• If a SUBPOP subcommand is specified, then effects specified in the MODEL subcommand<br />

can only be composed using the variables listed on the SUBPOP subcommand.<br />

• To include a main-effect term, enter the name of the factor on the MODEL subcommand.<br />

• To include an interaction-effect term among factors, use the keyword BY or the asterisk<br />

(*) to join factors involved in the interaction. For example, A*B*C means a three-way<br />

interaction effect of A, B, and C, where A, B, and C are factors. The expression A BY B<br />

BY C is equivalent to A*B*C. Factors inside an interaction effect must be distinct.<br />

Expressions like A*C*A and A*A are invalid.<br />

• To include a nested effect term, use the keyword WITHIN or a pair of parentheses on the<br />

MODEL subcommand. For example, A(B) means that A is nested within B, where A and

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