The software processes
all of the observations in the entire data set unless you specify
a range of observations with the STARTOBS= or ENDOBS= options. If
the STARTOBS= option is used without the ENDOBS= option, the implied
value of ENDOBS= is the end of the data set. When both options are
used together, the value of ENDOBS= must be greater than the value
of STARTOBS=.
When ENDOBS= is used
in a WHERE expression, the ENDOBS= value represents the last observation
to process, rather than the number of observations to return.