Table 1.

Types of Quantitative Data

Data type	Subtype	Description	Example	Attributes
Categorical	Nominal	Named group	Race: black, white, Asian, other Gender: Male, female, non-binary, other	Describe as n (%)
	Ordinal	Groups with a clear order	Education level: Low, middle, high income Satisfaction ratings	Describe as n (%)
Numerical	Discrete	Numbered items which can be counted	Number of coin flips Population count	Can be described as mean, median, mode
	Continuous	Numbers that represent measurements and are usually rounded	Age, height, weight White blood cell count	Can be described as mean, median, mode
	Interval	Numbers where the distance between numbers is standard and equal	Temperature pH	Describe as mean, median, mode Can be added or subtracted Cannot be multiplied or divided
	Ratio	Has all properties of interval data and uses the reference of a true zero (i.e., no negative numbers)	Age, weight, length Pulse rate	Describe as mean, median, mode Can be added, subtracted, multiplied or divided