We mentioned in the preface that in this book we try to balance between using the integrated development environment (IDE) and the code. In Chapters 5 and 6, we focus on the code. This chapter shows some advanced data cleaning and querying methods, such as using PROC SQL, SELECT, WHERE, WHEN, and DO loops.
Comment Statement
It is crucial to document your code so you and your peers can understand the reasoning behind how the analysis is constructed. In general, if you do not document your code, you might look at it after a few months and not remember ...
