Instead of reading specific observations, you might want to
determine when the last observation in an input data set has been
read, so that you can perform specific processing. For example, you
might want to output only one observation that contains grand
totals for numeric variables.
create a temporary numeric variable whose value is used to detect
the last observation, you can use the END= option in the SET
General form, END= option:
names a temporary variable that contains an end-of-file marker. The
variable, which is initialized to 0, is set to 1 when the SET
statement reads the last observation of the data set.
This variable is not