Help System (web edition)

Data in a data file: 
When processing the whole set of observations in a data file the name
of the data file is referred to in the statistical operation.
To select a subset of observations a specification of the form
DATA <name of data set> IN <data file>,<# of 1st obs.>,<# of last obs.> 
may be given in the current edit field.
For example, DATA SAMPLE IN FILE1,1,30 defines SAMPLE as the 30 first
observations of data file FILE1.
The last observation of the data file can generally be referred to by
END in the DATA ... IN ... construction. Thus the last 30 observations
of FILE1 can be defined by DATA SAMPLE2 IN FILE1,END-29,END.

Another possibility to select a subset of observations is to use the
IND, CASES and SELECT specifications (see SELECTC).

In all cases above only active variables of the data file will be
processed (see FILE ACTIVATE, MASK).
For general information on data files, see FILE?
  D = More information on data representation