Level of measurement

S. S. Stevens가 제안한 범주

Levels

Nominal

• 연산: $=$, $\ne$
• 중심경향성: Mode (statistics)
• Variability: Qualitative variation

Ordinal

• 연산: ,
• 중심경향성: Median
• Variability: Range, Interquartile range

Interval

• 연산: $+$, $-$
• 중심경향성: Arithmatic mean
• Variability: Deviation

Ratio

• 연산: $\times$, $÷$
• 중심경향성: Geometric mean, Harmonic mean
• Variability: Coefficient of variation, Studentized range

See also

• Nominal, ordinal, interval, and ratio typologies are misleading