User Guide

182
Chapter 8
Figure 8-4
Add Vari a bles dialog box
Excluded Variables. Variables to be excluded from the new, merged data file. By
default, this list contains any variable names from the external data file that duplicate
variab
le names in the working data file. Variables from the working data file are
identified with an asterisk (*). Variables from the external data file are identified with
a plus sign (+). If you want to include an excluded variable with a duplicate name in
the mer
ged file, you can rename it and add it to the list of variables to be included.
New Working Data File. Variablestobeincludedinthenew,mergeddatafile.By
default, all unique variable names in both data files are included on the list.
Key Var
iables.
If some cases in one file do not have matching cases in the other file
(that is, some cases are missing in one file), use key variables to identify and correctly
match cases from the two files. You can also use key variables with table lookup files.
 The key variables must have the same names in both data files.