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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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556 FACTOR<br />

• This example analyzes all variables between and including V1 and V12 in the working<br />

data file.<br />

• Six factors are extracted using the default principal components method, and the factor<br />

pattern matrix is not rotated.<br />

• PLOT sends all extracted factors to the graphics editor and shows a 3-D plot of the first three<br />

factors.<br />

EXTRACTION Subcommand<br />

EXTRACTION specifies the factor extraction technique.<br />

• Only one EXTRACTION subcommand is allowed. If multiple EXTRACTION subcommands<br />

are specified, only the last is performed.<br />

• If any ANALYSIS subcommand is explicitly specified, all EXTRACTION subcommands<br />

before the last ANALYSIS subcommand are ignored. If no EXTRACTION subcommand is<br />

specified after the last ANALYSIS subcommand, the default extraction is performed.<br />

• If EXTRACTION is not specified or is included without specifications, principal components<br />

extraction is used.<br />

• If you specify criteria for EXTRACTION, the CRITERIA subcommand must precede the<br />

EXTRACTION subcommand.<br />

• When you specify EXTRACTION, you should always explicitly specify the ROTATION<br />

subcommand. If ROTATION is not specified, the factors are not rotated.<br />

PC Principal components analysis (Harman, 1967). This is the default. PC can also be<br />

requested with keyword PA1 or DEFAULT.<br />

PAF Principal axis factoring. PAF can also be requested with keyword PA2.<br />

ALPHA Alpha factoring (Kaiser & Caffry, 1965). Invalid if METHOD=COVARIANCE.<br />

IMAGE Image factoring (Kaiser, 1963).<br />

ULS Unweighted least squares (Jöreskog, 1977). Invalid if METHOD=COVARIANCE.<br />

GLS Generalized least squares. Invalid if METHOD=COVARIANCE.<br />

ML Maximum likelihood (Jöreskog & Lawley, 1968). Invalid if METHOD=VARIANCE.<br />

Example<br />

FACTOR VARIABLES=V1 TO V12<br />

/ANALYSIS=V1 TO V6<br />

/EXTRACTION=ULS<br />

/ROTATE=NOROTATE.<br />

• This example analyzes variables V1 through V6 with an unweighted least-squares extraction.<br />

No rotation is performed.

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