- statements are instructions;
- instructures require actions;
- actions follow "first come first serve"
Key 2: Data Step is a big loop
- Data step starts from the first observation;
- It examines each following observation like an military official counting head;
- It ends up with the last observation.
- Proc means: let's find the average!
- Proc freq: percent, percent!
- Proc logistic: any relation, causation?
