SAS From Scratch - Episode 9 - The one with the RETAIN and DELETE

Welcome to the 9th video in the SAS From Scratch series! This video covers the LENGTH statement and how its use impacts the space that SAS reserves for variables. We'll also look at IF / ELSE statements in SAS and how we can nest them and combine them with the DO blocks to execute multiple lines of code if a condition is satisfied. A brief overview of De Morgan's laws will be provided as every programmer should know them. The DELETE statement gives us the power to instantly discard things from the PDV and we'll wrap up today's video by learning more about the RETAIN statement and how it affects the iteration of the DATA step.

Timepoints in this video:
00:00 - Introduction
01:07 - The LENGTH statement
09:00 - IF / ELSE blocks
18:45 - Combining IF / ELSE with the DO block and nesting IFs
23:00 - Understanding how SAS interprets conditional expressions
30:17 - De Morgan's Laws
35:39 - The DELETE statement
41:24 - The RETAIN statement
48:22 - Exercise 9.1
01:02:20 - EXTRA CREDITS: Taking control of DATA step iterations
01:16:04 - On the next episode...

If you would like to follow along, but don't have a SAS licence of your own, then do go ahead and register for "SAS OnDemand for Academics" here: https://welcome.oda.sas.com/

The Prep. Guide for SAS Base can be purchased here: https://sasinstitute.redshelf.com/app...