N [OF CASES] num_of_cases [ESTIMATED].
N OF CASES limits the number of cases processed by any
procedures that follow it in the command stream.
N OF CASES
100, for example, tells PSPP to disregard all cases after the first
N OF CASES is specified after
TEMPORARY, it affects
only the next procedure (see TEMPORARY). Otherwise, cases beyond
the limit specified are not processed by any later procedure.
If the limit specified on
N OF CASES is greater than the number
of cases in the active dataset, it has no effect.
N OF CASES is used along with
IF, the case limit is applied to the cases obtained after sampling or
case selection, regardless of how
N OF CASES is placed relative
SELECT IF in the command file. Thus, the
N OF CASES 100 and
SAMPLE .5 will both randomly
sample approximately half of the active dataset’s cases, then select the
first 100 of those sampled, regardless of their order in the command
N OF CASES with the
ESTIMATED keyword gives an estimated
number of cases before
DATA LIST or another command to read in
ESTIMATED never limits the number of cases processed by
procedures. PSPP currently does not make use of case count estimates.