In your log there is a note:  "Numeric values have been converted to characters";   It seems as MC041 in diabetes dataset was defined as CHAR type while MC041 in ami was defined as numeric ?  Is it?   For testing AMI better do:       if ami in (.  41001 41011 ... ) then ... ;   /* see PG Stats answer , and pay attention:                                                                     as ami is numeric you cant check for blank but for missing value */ ... View more