Levels of measurement

• What does levels of measurements refer to


  Refers to the way variables have been measured. Signify both types of data that has been collected and how sophiscated it is
• 4 levels of measurements

  • Nominal
  • Ordinal
  • Interval
  • Ratio
• Nominal data

  • Counts by categories
  • No true mathematical value
  • Basic form of data

  EG: bar charts and pie charts
• Ordinal data

  • Ranks/scales
  • Space between ranks is subjective
  • No true mathematical values
  • Understand relationships of places or ranks
• Interval data

  • True mathematical value (spaces been values equal and objective)
  • Can go below zero
  • eg: temperature
• Ratio data

  • True value of zero (cant go below zero)
  • Spaces between is continuous
  • True mathematical value
  • EG: height, weight, food, etc