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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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554 FACTOR<br />

• If more than one PLOT subcommand is specified, only the last one is in effect.<br />

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

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

after the last ANALYSIS subcommand, no plot is produced.<br />

EIGEN Scree plot (Cattell, 1966). The eigenvalues from each extraction are plotted<br />

in descending order.<br />

ROTATION Plots of variables in factor space. When used without any additional specifications,<br />

ROTATION can produce only high-resolution graphics. If three<br />

or more factors are extracted, a 3-D plot is produced with the factor space<br />

defined by the first three factors. You can request two-dimensional plots<br />

by specifying pairs of factor numbers in parentheses; for example, PLOT<br />

ROTATION(1,2)(1,3)(2,3) requests three plots, each defined by two factors.<br />

The ROTATION subcommand must be explicitly specified when you enter<br />

the keyword ROTATION on the PLOT subcommand.<br />

DIAGONAL Subcommand<br />

DIAGONAL specifies values for the diagonal in conjunction with principal axis factoring.<br />

• If DIAGONAL is omitted or included without specifications, FACTOR uses the default<br />

method for specifying the diagonal.<br />

• DIAGONAL is ignored with extraction methods other than PAF. The values are automatically<br />

adjusted by corresponding variances if METHOD=COVARIANCE.<br />

• If more than one DIAGONAL subcommand is specified, only the last one is in effect.<br />

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

before the last ANALYSIS subcommand are ignored. If no DIAGONAL is specified after the<br />

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

• Default communality estimates for PAF are squared multiple correlations. If these cannot<br />

be computed, the maximum absolute correlation between the variable and any other variable<br />

in the analysis is used.<br />

valuelist Diagonal values. The number of values supplied must equal the number of<br />

variables in the analysis block. Use the notation n* before a value to indicate<br />

that the value is repeated n times.<br />

DEFAULT Initial communality estimates.<br />

Example<br />

FACTOR VARIABLES=V1 TO V12<br />

/DIAGONAL=.56 .55 .74 2*.56 .70 3*.65 .76 .64 .63<br />

/EXTRACTION=PAF<br />

/ROTATION=VARIMAX.<br />

• The factor analysis includes all variables between and including V1 and V12 in the working<br />

data file.<br />

• DIAGONAL specifies 12 values to use as initial estimates of communalities in principal axis<br />

factoring.

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