Chapter 2. Combining Data Sets Vertically: Concatenating, Interleaving, and Appending Data Sets
Example 2.1 Concatenating Data Sets 14
Example 2.2 Interleaving Observations from Two or More Data Sets Based on a Common Variable 17
Example 2.3 Appending One Data Set to the End of Another Data Set 20
Example 2.4 Selecting Unique Rows When Concatenating Tables 23
Example 2.5 Selecting Rows in Common When Concatenating Tables 26
Example 2.6 Selecting Observations Unique to Each Data Set When Concatenating Data Sets 28
When you combine data sets vertically, you concatenate the data sets one after another, or you interleave observations from the data sets in order by one or more variables. Observations are not combined side-by-side horizontally or overlaid. ...
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