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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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548 FACTOR<br />

Subcommand Order<br />

• METHOD and SELECT can be specified anywhere. VARIABLES must be specified before<br />

any other subcommands, unless an input matrix is specified. MISSING must be specified<br />

before ANALYSIS.<br />

• The ANALYSIS, EXTRACTION, ROTATION, and SAVE subcommands must be specified in<br />

the order they are listed here. If you specify these subcommands out of order, you may get<br />

unpracticed results. For example, if you specify EXTRACTION before ANALYSIS and SAVE<br />

before ROTATION, EXTRACTION and SAVE are ignored. If no EXTRACTION and SAVE<br />

subcommands are specified in proper order, the default will be used, that is, PC for<br />

EXTRACTION and no SAVE.<br />

• The FORMAT subcommand can be specified anywhere after the VARIABLES subcommand.<br />

• If an ANALYSIS subcommand is present, the statistical display options on PRINT, PLOT, or<br />

DIAGONAL must be specified after it. PRINT, PLOT, and DIAGONAL subcommands specified<br />

before the ANALYSIS subcommand are ignored. If no such commands are specified<br />

after the ANALYSIS subcommand, the default is used.<br />

• The CRITERIA subcommand can be specified anywhere, but applies only to the subcommands<br />

that follow. If no CRITERIA subcommand is specified before EXTRACTION or<br />

ROTATION, the default criteria for the respective subcommand are used.<br />

Example<br />

FACTOR VAR=V1 TO V12<br />

/ANALYSIS=V1 TO V8<br />

/CRITERIA=FACTORS(3)<br />

/EXTRACTION=PAF<br />

/ROTATION=QUARTIMAX.<br />

• The default CORRELATION method is used. FACTOR performs a factor analysis of the<br />

correlation matrix based on the first eight variables in the working data file (V1 to V8).<br />

• The procedure extracts three factors using the principal axis method and quartimax<br />

rotation.<br />

• LISTWISE (the default for MISSING) is in effect. Cases with missing values for any one of<br />

the variables from V1 to V12 are omitted from the analysis. As a result, if you ask for the<br />

factor analysis using VAR=V1 TO V8 and ANALYSIS=ALL, the results may be different even<br />

though the variables used in the analysis are the same.<br />

<strong>Syntax</strong> Rules<br />

• Each FACTOR procedure performs only one analysis with one extraction and one rotation.<br />

Use multiple FACTOR commands to perform multiple analyses.<br />

• VARIABLES or MATRIX=IN can be specified only once. Any other subcommands can be<br />

specified multiple times but only the last in proper order takes effect.

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