Numeric Attribute Types a Quantity(integer or real-valued ■ nterval a Measured on a scale of equal-sized units a Values have order > E.g., temperature in C or F, calendar dates 口 No true zero-point Ratio 口 Inherent zero- point a We can speak of values as being an order of magnitude larger than the unit of measurement (10 K is twice as high as 5K) >e.g., temperature in Kelvin, length, counts, monetary guantities 8 同济大学软件学院 ool of Software Engineering. Tongpi Unversity8 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