User Guide

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Chapter 8
Add Variables: Rename
You can rename variables from either the working data file or the external file before
moving them to the list of variables to be included in the merged data file. This is
primarily u
seful if you want to include two variables with the same name that contain
different information in the two files.
Aggregate
Data
Aggregate
Data aggregates groups of cases in the working data file into single cases
and creates a new, aggregated file or creates new variables in the working data file
that contain aggregated data. Cases are aggregated based on the value of one or
more break
(grouping) variables.
 If you cre
ate a new, aggregated data file, the new data file contains one case for
each group defined by the break variables. For example, if there is one break
variable with two values, the new data file will contain only two cases.
 If you add aggregate variables to the working data file, the data file itself is not
aggregat
ed. Each case with the same value(s) of the break variable(s) receives
the same values for the new aggregate variables. For example, if gender is the
only break variable, all males would receive the same value for a new aggregate
variabl
e that represents average age.