W: 2-3 Identifying variables

In this chapter you will learn about:

  • What variables and concepts are and how they are different
  • How to turn concepts into operational variables
  • Types of variables from the viewpoint of: 
  1. Causation
  2. The study design
  3. The unit of measurement
  • Types of measurement scales:
  1. The nominal or classificatory scale
  2. The ordinal or ranking scale
  3. The interval scale
  4. The ratio scale