In addition to adding new observations to an analysis data set, you mightneed to combine
variables from multiple data sources into a single analysis data set. In this situation, you
have different variables for the same collections of observations. This section focuses on
adding variables from multiple data sourcesto build a single analysis data set. Thistaskis
shown in Display 2.25. The key point is that a common variable—in this case,
OBSERVATION ID—is available for gluing together these data sources.Display 2.25
shows thefirst data set with seven observations ...
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