PROC NLMIXED: BOUNDS Statement :: SAS/STAT(R) 9.2 User's Guide, Second Edition

The NLMIXED Procedure

BOUNDS Statement

BOUNDS b_con [ , b_con...] ;

where	b_con :=	number operator parameter_list operator number
or	b_con :=	number operator parameter_list
or	b_con :=	parameter_list operator number
and	operator :=	$\text{[math]}$ , <, $\text{[math]}$ , or >

Boundary constraints are specified with a BOUNDS statement. One- or two-sided boundary constraints are allowed. The list of boundary constraints are separated by commas. For example:

      bounds 0 <= a1-a9 X <= 1, -1 <= c2-c5;
      bounds b1-b10 y >= 0;

You can specify more than one BOUNDS statement. If you specify more than one lower (upper) bound for the same parameter, the maximum (minimum) of these is taken.

If the maximum $\text{[math]}$ of all lower bounds is larger than the minimum of all upper bounds $\text{[math]}$ for the same parameter $\text{[math]}$ , the boundary constraint is replaced by $\text{[math]}$ defined by the minimum of all upper bounds specified for $\text{[math]}$ .

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