# Level of measurement

> S. S. Stevens가 제안한 범주

<S. S. Stevens>가 제안한 범주

## Levels

### Nominal

- 연산: $=$, $\neq$
- <중심경향성>: <Mode (statistics)>
- Variability: <Qualitative variation>

### Ordinal

- 연산: $>$, $<$
- <중심경향성>: <Median>
- Variability: <Range>, <Interquartile range>

### Interval

- 연산: $+$, $-$
- <중심경향성>: <Arithmatic mean>
- Variability: <Deviation>

### Ratio

- 연산: $\times$, $\div$
- <중심경향성>: <Geometric mean>, [Harmonic mean](https://wiki.g15e.com/pages/Harmonic%20mean.txt)
- Variability: <Coefficient of variation>, <Studentized range>

## See also

- [Nominal, ordinal, interval, and ratio typologies are misleading](https://wiki.g15e.com/pages/Nominal,%20ordinal,%20interval,%20and%20ratio%20typologies%20are%20misleading.txt)