SPSS® 12.0 Command Syntax Reference

106 ALSCAL
• INITIAL is the default. INITIAL indicates that the external configuration or weights are to be
used as initial coordinates and are to be modified during each iteration.
• FIXED forces ALSCAL to use the externally defined structure without modification to calculate
the best values for all unfixed portions of the structure.
CONFIG Read stimulus configuration. The configuration/weights file contains initial
stimulus coordinates. Input of this type is appropriate when
SHAPE=SYMMETRIC or SHAPE=ASYMMETRIC, or when the number of
variables in a matrix equals the number of variables on the ALSCAL command.
The value of the TYPE_ variable must be either CON or ROW for
all stimulus coordinates for the configuration.
ROWCONF Read row stimulus configuration. The configuration/weights file contains
initial row stimulus coordinates. This specification is appropriate if
SHAPE=RECTANGULAR and if the number of ROWCONF rows in the matrix
equals the number of rows specified on the INPUT subcommand (or, if
INPUT is omitted, the number of cases in the working data file). The value of
TYPE_ must be either ROW or CON for the set of coordinates for each row.
COLCONF Read column stimulus configuration. The configuration/weights file contains
initial column stimulus coordinates. This kind of file can be used only
if SHAPE=RECTANGULAR and if the number of COLCONF rows in the matrix
equals the number of variables on the ALSCAL command. The value of
TYPE_ must be COL for the set of coordinates for each column.
SUBJWGHT Read subject (matrix) weights. The configuration/weights file contains subject
weights. The number of observations in a subject-weights matrix must
equal the number of matrices in the proximity file. Subject weights can be
used only if the model is INDSCAL, AINDS, or GEMSCAL. The value of TYPE_
for each set of weights must be SUB.
STIMWGHT Read stimulus weights. The configuration/weights file contains stimulus
weights. The number of observations in the configuration/weights file must
equal the number of matrices in the proximity file. Stimulus weights can be
used only if the model is AINDS or ASCAL. The value of TYPE_ for each set
of weights must be STI.
If the optional specifications for the configuration/weights file are not specified on FILE,
ALSCAL sequentially reads the TYPE_ values appropriate to the model and shape according
to the defaults in Table 1.
Example
ALSCAL VAR=V1 TO V8 /FILE=ONE CON(FIXED) STI(INITIAL).
• ALSCAL reads the configuration/weights file ONE.
• The stimulus coordinates are read as fixed values, and the stimulus weights are read as
initial values.