SPSS® 12.0 Command Syntax Reference

192 Syntax Reference
Example
DISCRETIZATION subcommand for this purpose, except for variables you want to treat as
numerical, since the characteristic of equal intervals in the data will not be maintained.
• There must be at least three valid cases.
• Split-file has no implications for CATPCA.
CATPCA VARIABLES = TEST1 TEST2 TEST3 TO TEST6 TEST7 TEST8
/ANALYSIS = TEST1 TO TEST2(WEIGHT=2 LEVEL=ORDI)
TEST3 TO TEST5(LEVEL=SPORD INKNOT=3)
TEST6 TEST7(LEVEL=SPORD DEGREE=3)
TEST8(LEVEL=NUME)
/DISCRETIZATION = TEST1(GROUPING NCAT=5 DISTR=UNIFORM)
TEST6(GROUPING) TEST8(MULTIPLYING)
/MISSING = TEST5(ACTIVE) TEST6(ACTIVE EXTRACAT) TEST8(LISTWISE)
/SUPPLEMENTARY = OBJECT(1 3) VARIABLE(TEST1)
/CONFIGURATION = (’iniconf.sav’)
/DIMENSION = 2
/NORMALIZATION = VPRINCIPAL
/MAXITER = 150
/CRITITER = .000001
/PRINT = DESCRIP LOADING CORR QUANT(TEST1 TO TEST3) OBJECT
/PLOT = TRANS(TEST2 TO TEST5) OBJECT(TEST2 TEST3)
/SAVE = TRDATA OBJECT
/OUTFILE = TRDATA(’c:\data\trans.sav’) OBJECT(’c:\data\obs.sav’).
• VARIABLES defines variables. The keyword TO refers to the order of the variables in the
working data file.
• The ANALYSIS subcommand defines variables used in the analysis. It is specified that
TEST1 and TEST2 have a weight of 2. For the other variables, WEIGHT is not specified;
thus, they have the default weight value of 1. The optimal scaling level for TEST1 and
TEST2 is ordinal, for TEST3 to TEST7 spline ordinal, and for TEST8 numerical. The
keyword TO refers to the order of the variables in the VARIABLES subcommand. The
splines for TEST3 to TEST5 have degree 2 (default because unspecified) and 3 interior
knots. The splines for TEST6 and TEST7 have degree 3 and 2 interior knots (default
because unspecified).
• DISCRETIZATION specifies that TEST6 and TEST8, which are fractional-value variables,
are discretized: TEST6 by recoding into 7 categories with a normal distribution (default
because unspecified) and TEST8 by “multiplying.” TEST1, which is a categorical
variable, is recoded into 5 categories with a close-to-uniform distribution.
• MISSING specifies that objects with missing values on TEST5 and TEST6 are included in
the analysis; missing values on TEST5 are replaced with the mode (default if not specified)
and missing values on TEST6 are treated as an extra category. Objects with a missing
value on TEST8 are excluded from the analysis. For all other variables, the default is in
effect; that is, missing values (Note: values, not objects) are excluded from the analysis.
• CONFIGURATION specifies iniconf.sav as the file containing the coordinates of a configuration
that is to be used as the initial configuration (default because unspecified).
• DIMENSION specifies the number of dimensions to be 2; that is, 2 components are
computed. This is the default, so this subcommand could be omitted here.