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Numeric Attribute Types

  • Quantity (integer or real-valued)
  • Interval
      • Measured on a scale of equal-sized units
      • Values have order
        • E.g., temperature in C˚or F˚, calendar dates
      • No true zero-point
  • Ratio
      • Inherent zero-point
      • We can speak of values as being an order of magnitude larger than the unit of measurement (10 K˚ is twice as high as 5 K˚).
        • e.g., temperature in Kelvin, length, counts, monetary quantities

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