MODEL PROGRAM A=.5 B=1.6.
COMPUTE PRED=A*SPEED**B.
DERIVATIVES.
COMPUTE D.A=SPEED**B.
COMPUTE D.B=A*LN(SPEED)*SPEED**B.
NLR STOP.
-
MODEL PROGRAM assigns values to the model parameters A and B.
-
COMPUTE generates
the variable PRED to define the
nonlinear model using parameters A and B and the variable SPEED from the active dataset. Because this
variable is named PRED, the PRED subcommand is not required on NLR.
-
DERIVATIVES indicates that calculations for derivatives are being supplied.
- The two
COMPUTE statements on the DERIVATIVES transformations list calculate the derivatives for the parameters A and B. If either parameter had been omitted, NLR would have calculated it numerically.
-
NLR specifies STOP as the dependent variable. It is not
necessary to specify SPEED as the
independent variable because it has been used in the model and derivatives
programs.