Reflects how much information data carries — from least to most informative:

1. Nominal — categories only
2. Ordinal — categories with order
3. Interval — ordered with equal spacing, no true zero
4. Ratio — ordered, equal spacing, and a true zero

Source

Bobbitt, Z. (2020, January 3). Levels of Measurement: Nominal, Ordinal, Interval and Ratio. Retrieved June 7, 2026, from Statology website: https://www.statology.org/levels-of-measurement-nominal-ordinal-interval-and-ratio/

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