Topic: Variables, Data Types and Questions

Likert Items and Rating Scales

Individuals, Cases, and Observational Units

Identifiers, Categories, and Numbers: A Classification Clinic

Identifiers Are Not Measurements

From a Real-World Question to Its Variables

Discrete Counts and Continuous Measurements

Descriptive Questions About a Single Variable

Dates, Durations, and Time Variables

Counts, Rates, and Denominators

Constructing Simple Derived Variables