The specified value is multiplied by 10 -8 and entered into the NLOPTIONS statement in PROC GLIMMIX.Note : If you see errors regarding NEWRAP convergence in the SAS log after you run the ANOVA , you should increase this number to specify a less restrictive criterion so as to avoid this convergence error. You should experiment with different values to achieve a reasonable restrictive criterion and strike a reasonable balance between convergence errors and reliability.Please refer to the SAS PROC GLIMMIX documentation for more details.