Data Management and Manipulation
Append Data Files
Append combines rows from files that represent the same kind of observational unit.
Page 1 of 7 · Big Picture
The big picture: Append Data Files
When do rows from separate files represent the same kind of unit?
Why a policy analyst should care
Appending can extend a population across places or years only when the stacked files describe compatible units and harmonized variables.
Follow the idea from the opening question to a practical decision. These are the conceptual moves this module will develop:
1 Question When do rows from separate files represent the same kind of unit?
2 Explore Combine waves or regions with common structure
3 Formalize Stack observations vertically
4 Transfer Audit an append
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