The NLIN Procedure

Syntax

PROC NLIN < options > ;: MODEL dependent=expression ;; PARAMETERS parameter=values <,..., parameter=values>;; other program statements; BOUNDS inequality < , ... , inequality > ;; BY variables ;; DER.parameter=expression ;; DER.parameter.parameter=expression ;; ID variables ;; OUTPUT OUT=SAS-data-set keyword=names <,...,keyword=names>;; CONTROL variable <=values> < ... variable <=values> > ;

A vertical bar (|) denotes a choice between two specifications. The other program statements are valid SAS expressions that can appear in the DATA step. PROC NLIN enables you to create new variables within the procedure and use them in the nonlinear analysis. The NLIN procedure automatically creates several variables that are also available for use in the analysis. See the the section "Special Variables" for more information. The PROC NLIN, PARMS, and MODEL statements are required.

The statements used in PROC NLIN, in addition to the PROC statement, are as follows:

BOUNDS: constrains the parameter estimates within specified bounds
BY: specifies variables to define subgroups for the analysis
DER: specifies the first or second partial derivatives
ID: specifies additional variables to add to the output data set
MODEL: defines the relationship between the dependent and independent variables
OUTPUT: creates an output data set containing statistics for each observation
PARMS: identifies parameters to be estimated and the starting values for each parameter
other program statements: includes assignment statements, ARRAY statements, DO loops, and program control statements

Syntax

PROC NLIN Statement

BOUNDS Statement

BY Statement

CONTROL Statement

DER Statements

ID Statement

MODEL Statement

OUTPUT Statement

PARAMETERS Statement

RETAIN Statement

Other Program Statements with PROC NLIN