Appending datasets means stacking rows — taking two tables with the same (or compatible) column structure and producing one table with all the rows combined.
A typical clinical use case is combining data from multiple studies or sites into a single analysis-ready dataset.
SAS offers PROC APPEND or a DATA step with multiple SET datasets. Tidyverse provides bind_rows(). Base R provides rbind().
This lesson appends a small second dataset to the original CLASS dataset, producing a combined table.
After running, the combined dataset has all rows from both inputs.