SPSS® 12.0 Command Syntax Reference

REGRESSION 1361
• ORIGIN and NOORIGIN affect the way the correlation matrix is built. If matrix materials
are used as input to REGRESSION, the keyword that was in effect when the matrix was
written should be in effect when that matrix is read.
Example
REGRESSION VAR=(COL)
/ORIGIN
/DEP=HOMICIDE
/METHOD=ENTER POVPCT.
• The REGRESSION command requests an equation that regresses HOMICIDE on POVPCT
and suppresses the constant (ORIGIN).
REGWGT Subcommand
The only specification on REGWGT is the name of the variable containing the weights to be
used in estimating a weighted least-squares model. With REGWGT the default display is the
usual REGRESSION display.
• REGWGT is a global subcommand.
• If more than one REGWGT subcommand is specified on a REGRESSION procedure, only
the last one is in effect.
• REGWGT can be used with MATRIX OUT but not with MATRIX IN.
• Residuals saved from equations using the REGWGT command are not weighted. To obtain
weighted residuals, multiply the residuals created with SAVE by the square root of the
weighting variable in a COMPUTE statement.
• REGWGT is in effect for all equations and affects the way the correlation matrix is built.
Thus, if REGWGT is specified on a REGRESSION procedure that writes matrix materials
to a matrix data file, subsequent REGRESSION procedures using that file will be automatically
weighted.
Example
REGRESSION VARIABLES=GRADE GPA STARTLEV TREATMNT
/DEPENDENT=GRADE
/METHOD=ENTER
/SAVE PRED(P).
COMPUTE WEIGHT=1/(P*(1-P)).
REGRESSION VAR=GRADE GPA STARTLEV TREATMNT
/REGWGT=WEIGHT
/DEP=GRADE
/METHOD=ENTER.
• VARIABLES builds a correlation matrix that includes GRADE, GPA, STARTLEV, and
TREATMNT.
• DEPENDENT identifies GRADE as the dependent variable.
• METHOD regresses GRADE on GPA, STARTLEV, and TREATMNT.
• SAVE saves the predicted values from the regression equation as variable P in the working
data file (see the SAVE subcommand on p. 1374).