Key definitions

• Nominal Data


  Qualitative data, usually tallied and not able to rank. e.g. gender
• Ordinal Data


  Scaled or ranked, often seen as a score (1 - 5)
• Interval Data


  Ranked data with standardised measurements. Uses pre-existing measurement scales. e.g. temperature, time)
• Ratio Data

  Interval data, however includes an absolute zero