In statistics, the term "level of measurement" is broadly known as **scale of measurement**.
It refers to the way by which a variable or a number is represented and categorized. Levels of measurement are basically types of data that are introduced by psychologist **Stanley Smith Stevens**. They have a certain types of
properties which determine the use of statistical analyses.

There are four different types of level of measurements as discussed below:

**Nominal****Ordinal****Interval****Ratio**

- Eye color - Blue, black, brown, green, hazel etc.
- Gender - Male, female.
- Religion - Hindu, Catholic, Muslim etc.
- Race - African, Asian, European, Caucasian etc.
- Marital status - Married, unmarried, divorced.

- Grades - A+, A, B+, B, C+, C, etc.
- Ranks - 1$^{st}$, 2$^{nd}$, 3$^{rd}$ etc.
- Sizes - Small, medium, large, extra large etc.

Interval level lacks true zero point. It does not specifies zero as reference point.

Ratio Level of Measurement:

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