CONSTANT and NOCONSTANT Subcommands (CURVEFIT command)

CONSTANT and NOCONSTANT indicate whether a constant term should be estimated in the regression equation. The specification overrides the corresponding setting on the TSET command.

• CONSTANT indicates that a constant should be estimated. It is the default unless changed by TSET NOCONSTANT prior to the current procedure.
• NOCONSTANT eliminates the constant term from the model.

Example

CURVEFIT VARIABLES = Y1
  /MODEL=COMPOUND
  /NOCONSTANT.

• In this example, a compound curve is fit to Y1 with no constant term in the model.