SPSS® 12.0 Command Syntax Reference

Example
PRINCALS 1241
can use COMPUTE or RECODE to change the value to something outside of the valid
range. Values outside of the range (less than 1 or greater than the maximum value) are
treated as system-missing.
PRINCALS VARIABLES=ACOLA BCOLA(2) PRICEA PRICEB(5)
/ANALYSIS=ACOLA BCOLA(SNOM) PRICEA PRICEB(NUME)
/PRINT=QUANT OBJECT.
• VARIABLES defines the variables and their maximum number of levels.
• The ANALYSIS subcommand specifies that variables ACOLA and BCOLA are single nominal
(SNOM) and that variables PRICEA and PRICEB are numeric (NUME).
• The PRINT subcommand lists the category quantifications and object scores.
• By default, plots of the category quantifications and the object scores are produced.
VARIABLES Subcommand
VARIABLES specifies all of the variables that will be used in the current PRINCALS procedure.
• The VARIABLES subcommand is required and precedes all other subcommands. The
actual word VARIABLES can be omitted.
• Each variable or variable list is followed by the maximum number of categories (levels)
in parentheses.
• The number specified in parentheses indicates the number of categories and the maximum
category value. For example, VAR1(3) indicates that VAR1 has three categories coded 1, 2,
and 3. However, if a variable is not coded with consecutive integers, the number of
categories used in the analysis will differ from the number of observed categories. For
example, if a three category variable is coded {2, 4, 6}, the maximum category value is 6.
The analysis treats the variable as having six categories, three of which are not observed
and receive quantifications of 0.
• To avoid unnecessary output, use the AUTORECODE or RECODE command before
PRINCALS to recode a categorical variable that was coded with nonsequential values. As
noted in “Limitations,” recoding is not recommended with variables treated as numeric
(see the SPSS Base Syntax Reference Guide for more information on AUTORECODE and
RECODE).