data SumStd;
set SumStd;
format Panel_ID DAY;
informat Panel_ID DAY;
run;
The above DATA step is to remove the format applied on Panel_ID and DAY. Then BCHOICE in SAS/STAT 13.1 will run fine.
In newer versions (SAS/STAT 13.2, 14.1, and 14.2), this problem has been fixed, and you don't even need to sort subjects.
Amy Shi
email: amy.shi@sas.com
Senior Research Statistician Developer
Bayesian Statistical Modeling
Advanced Analytics Division (R&D-AA)
SAS
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