ROTATION Subcommand (FACTOR command)
ROTATION
specifies the factor rotation method. It can also be used to suppress
the rotation phase entirely.
- Only one
ROTATION
subcommand is allowed. If multipleROTATION
subcommands are specified, only the last is performed. - If any
ANALYSIS
subcommand is explicitly specified, allROTATION
subcommands before the lastANALYSIS
subcommand are ignored. If anyEXTRACTION
subcommand is explicitly specified, allROTATION
subcommands before the lastEXTRACTION
subcommand are ignored. - If
ROTATION
is omitted together withEXTRACTION
, varimax rotation is used. - If
ROTATION
is omitted butEXTRACTION
is not, factors are not rotated. - Keyword
NOROTATE
on theROTATION
subcommand produces a plot of variables in unrotated factor space if thePLOT
subcommand is also included for the analysis.
VARIMAX. Varimax rotation. This is the default if ROTATION
is entered without specifications or if EXTRACTION
and ROTATION
are both omitted. Varimax rotation can also be requested with keyword
DEFAULT
.
EQUAMAX. Equamax rotation.
QUARTIMAX. Quartimax rotation.
OBLIMIN(n). Direct oblimin rotation. This is a nonorthogonal rotation; thus, a factor correlation matrix will also be displayed. You can specify a delta (n≤0.8) in parentheses. The value must be less than or equal to 0.8. The default is 0.
PROMAX(n). Promax rotation. This is a nonorthogonal rotation; thus, a factor correlation matrix will also be displayed. For this method, you can specify a real-number value greater than 1. The default is 4.
NOROTATE. No rotation.
Example
FACTOR VARIABLES=V1 TO V12
/EXTRACTION=ULS
/ROTATION
/ROTATION=OBLIMIN.
- The first
ROTATION
subcommand specifies the default varimax rotation. - The second
ROTATION
subcommand specifies an oblimin rotation based on the same extraction of factors.