08-14-2013 02:44 AM
I am new to Proc GENMOD. Sometimes when I execute this procedure it gives an error Negative Binomial dispersion parameter too large to continue. At other times it executes perfectly. I do not have any idea about the problem or what is the meaning of the error. Below is the code I am using:
ODS SELECT NONE;
proc genmod data=&indsn. ;
model var1 = var2/ dist=nb link=log;
output out = &outdsn.
pred = EXACT_1 ;
ODS SELECT ALL;
I am using SAS 9.3 now, previously in SAS 9.1.3 I have never faced this problem. Is there a change in the procedure for 9.3? If not then what may be the problem.
Any help is appreciated.
Thanks in advance for your help.
08-14-2013 08:28 AM
If this is the same data that gave an answer in 9.1.3, then I would first check what values for the dispersion parameter were obtained under 9.1.3 and see if they were reasonable. If the parameter values were reasonable, then I strongly suggest opening a ticket with SAS Technical Support, as radical changes were not implemented in the algorithm between 9.1.3 and 9.3, that I know of.