This document summarizes how to use the PROC TRANSPOSE procedure in SAS to transpose a dataset from long to wide format. It explains that PROC TRANSPOSE requires specifying what should stay the same (the BY statement), what goes up to become column names (the ID statement), what goes down to become row names (the VAR statement), and what gets positioned in the middle of the transposed table (the values from the VAR statement). Several examples are provided to demonstrate how to properly structure the BY, ID, and VAR statements to achieve the desired transposition.