Automatic variables are created automatically by the DATA step or by DATA step statements. These variables are added to the program data vector but are not output to the data set being created. The values of automatic variables are retained from one iteration of the DATA step to the next, rather than set to missing.
Automatic variables that are created by specific statements are documented with those statements. For examples, see the BY statement, the MODIFY statement, and the WINDOW statement in SAS Language Reference: Dictionary.
is 0 by default but is set to 1 whenever an error is encountered, such as an input data error, a conversion error, or a math error, as in division by 0 or a floating point overflow. You can use the value of this variable to help locate errors in data records and to print an error message to the SAS log.