Example 6.4 Adding Observations and Variables to the Master Data Set When Duplicate Matching Variable Values Exist in the Transaction Data Set
Goal
Match a master data set and transaction data set where the master data set has only unique combinations of the values of the matching variables and the transaction data set can have duplicate combinations. Keep the multiple observations for the duplicate combinations of the matching variables in the output data set. Only keep information from the transaction data set for observations with a match in the master data set.
Examples 6.1, 6.2, 6.3, 6.4, and 6.5 illustrate ways to update common variables when combining data sets. The five examples apply the methods to the same master data set. Different ...
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