SPSS® 12.0 Command Syntax Reference

484 DISCRIMINANT
Split Files
• When split-file processing is in effect, the first variables in the matrix data file will be
split variables, followed by ROWTYPE_, the grouping variable, VARNAME_, and then the
variables used to form the correlation matrix.
• A full set of matrix materials is written for each subgroup defined by the split variables.
• A split variable cannot have the same variable name as any other variable written to the
matrix data file.
• If split-file processing is in effect when a matrix is written, the same split file must be in
effect when that matrix is read by another procedure.
STDDEV and CORR Records
Records written with ROWTYPE_ values STDDEV and CORR are influenced by specifications
on the STATISTICS and CLASSIFY subcommands.
• If BOXM or GCOV is specified on STATISTICS or SEPARATE is specified on CLASSIFY, the
STDDEV and CORR records represent within-cell data and receive values for the
grouping variable.
• If none of the above specifications is in effect, the STDDEV and CORR records represent
pooled values. The STDDEV vector contains the square root of the mean square error for
each variable, and STDDEV and CORR records receive the system-missing value for the
grouping variable.
Missing Values
Example
Missing-value treatment affects the values written to a matrix data file. When reading a
matrix data file, be sure to specify a missing-value treatment on DISCRIMINANT that is
compatible with the treatment that was in effect when the matrix materials were generated.
GET FILE=UNIONBK /KEEP WORLD FOOD SERVICE BUS MECHANIC
CONSTRUC COOK MANAGER FSALES APPL RENT.
DISCRIMINANT GROUPS=WORLD(1,3)
/VARIABLES=FOOD SERVICE BUS MECHANIC CONSTRUC COOK MANAGER FSALES
/METHOD=WILKS
/PRIORS=SIZE
/MATRIX=OUT(DISCMTX).
• DISCRIMINANT reads data from the SPSS-format data file UNIONBK and writes one set of
matrix materials to the file DISCMTX.
• The working data file is still UNIONBK. Subsequent commands are executed on this file.