How to classify data:

• Type of Data
  • Explained in 4
• Measurement Level
  • Qualitative
    • Nominal
      • Not numbers, and cannot be ordered
    • Ordinal
      • Consist in groups and categories that follow a strict order.
  • Quantitative
    • Interval
      • No true 0
        • Example: Temperature (since 0 Degrees Celsius and 0 Fahrenheit are not true zeros)
    • Ratio
      • Has a true 0
        • Example: Number of Objects, Distance, Time, Temperature (only for Kelvin)