keep parameters fixed in PROC NLMIXED

[mgx]

Dear all,

I want to estimate some parameters in proc NLMIXED, while keeping others fixed at a certain value.

In proc GLIMMIX you can use /hold=. in the parms statement, does there exist an equivalent in PROC NLMIXED?

Kind regards,

Margaux

[Rick_SAS · Accepted solution]

Any value that you do not put on the PARMS statement will be treated as a constant. For example, if you always want the intercept to be 3, you can use

proc NLMIXED data=Have;
PARMS b1=0 b2=0;
Intercept = 3;   /* held constant */
pred = Intercept + b1*x1 + b2*x2;
...
run;