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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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ANALYSIS Subcommand<br />

LEVEL Keyword<br />

CATREG 211<br />

ANALYSIS specifies the dependent variable and the independent variables following the<br />

keyword WITH.<br />

• All the variables on ANALYSIS must be specified on the VARIABLES subcommand.<br />

• The ANALYSIS subcommand is required and follows the VARIABLES subcommand.<br />

• The first variable list contains exactly one variable as the dependent variable, while the<br />

second variable list following WITH contains at least one variable as an independent<br />

variable. Each variable may have at most one keyword in parentheses indicating the<br />

transformation type of the variable.<br />

• The keyword TO in the independent variable list honors the order of variables on the<br />

VARIABLES subcommand.<br />

• Optimal scaling levels are indicated by the keyword LEVEL in parentheses following the<br />

variable or variable list.<br />

LEVEL Specifies the optimal scaling level.<br />

The following keywords are used to indicate the optimal scaling level:<br />

SPORD Spline ordinal (monotonic). This is the default for a variable listed<br />

without any optimal scaling level, for example, one without LEVEL in<br />

the parentheses after it or with LEVEL without a specification. Categories<br />

are treated as ordered. The order of the categories of the observed<br />

variable is preserved in the optimally scaled variable. Categories will<br />

be on a straight line through the origin. The resulting transformation is<br />

a smooth nondecreasing piecewise polynomial of the chosen degree.<br />

The pieces are specified by the number and the placement of the<br />

interior knots.<br />

SPNOM Spline nominal (non-monotonic). Categories are treated as unordered.<br />

Objects in the same category obtain the same quantification. Categories<br />

will be on a straight line through the origin. The resulting transformation<br />

is a smooth piecewise polynomial of the chosen degree. The<br />

pieces are specified by the number and the placement of the interior<br />

knots.<br />

ORDI Ordinal. Categories are treated as ordered. The order of the categories<br />

of the observed variable is preserved in the optimally scaled variable.<br />

Categories will be on a straight line through the origin. The resulting<br />

transformation fits better than SPORD transformation, but is less<br />

smooth.<br />

NOMI Nominal. Categories are treated as unordered. Objects in the same<br />

category obtain the same quantification. Categories will be on a<br />

straight line through the origin. The resulting transformation fits better<br />

than SPNOM transformation, but is less smooth.

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