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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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SPORD and SPNOM Keywords<br />

The following keywords are used with SPORD and SPNOM:<br />

CATPCA 195<br />

DEGREE The degree of the polynomial. It can be any positive integer. The default<br />

degree is 2.<br />

INKNOT The number of interior knots. The minimum is 0, and the maximum is the<br />

number of categories of the variable minus 2. The procedure adjusts the<br />

number of interior knots to the maximum if the specified value is too large.<br />

The default number of interior knots is 2.<br />

DISCRETIZATION Subcommand<br />

DISCRETIZATION specifies fractional-value variables you want to discretize. Also, you can<br />

use DISCRETIZATION for ranking or for two ways of recoding categorical variables.<br />

• A string variable’s values are always converted into positive integers, according to the<br />

internal numeric representations. DISCRETIZATION for string variables applies to these<br />

integers.<br />

• When the DISCRETIZATION subcommand is omitted or when the DISCRETIZATION<br />

subcommand is used without a variable list, fractional-value variables are converted into<br />

positive integers by grouping them into seven categories with a close to “normal”<br />

distribution.<br />

• When no specification is given for variables in a variable list following DISCRETIZATION,<br />

these variables are grouped into seven categories with a close to “normal” distribution.<br />

• In CATPCA, values less than 1 are considered to be missing (see MISSING subcommand).<br />

However, when discretizing a variable, values less than 1 are considered to be valid and<br />

are thus included in the discretization process.<br />

GROUPING Recode into the specified number of categories.<br />

RANKING Rank cases. Rank 1 is assigned to the case with the smallest value on<br />

the variable.<br />

MULTIPLYING Multiplying the standardized values of a fractional-value variable by<br />

10, rounding, and adding a value such that the lowest value is 1.<br />

GROUPING Keyword<br />

GROUPING has the following keywords:<br />

NCAT Number of categories. When NCAT is not specified, the number of categories<br />

is set to 7. You may either specify a number of categories or use the keyword<br />

DISTR.<br />

EQINTV Recode intervals of equal size. The size of the intervals must be specified (no<br />

default). The resulting number of categories depends on the interval size.

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