Convergence Status Table

The "Convergence Status" table can be used to programmatically check the status of an estimation. This table contains the Status variable that takes on the value 0, 1, 2, or 3. If Status takes on a value less than 3, the convergence criterion was met. Specifically, the values mean the following:

Status=0

indicates that the convergence criterion was met and no warning or error messages were issued during the PROC NLIN run. Also, no notes that could indicate a problem with the model were issued.

Status=1

indicates that the convergence criterion was met and notes were written to the log that might indicate a problem with the model.

Status=2

indicates that the convergence criterion was met and one or more warning messages were produced during the PROC NLIN run.

Status=3

indicates that the convergence criterion was not met.

The following sample program demonstrates how the "Convergence Status" table can be used:

   ods output ConvergenceStatus=ConvStatus;
   proc nlin data=YourData;
      parameters a=1 b=1 c=1;
      model wgt = a + x / (b*y+c*z);
   run;
   
   data _NULL_; set ConvStatus;
     if status > 0 then put "A problem occurred";
   run;