Nominal | Ordinal | Scale | |
---|---|---|---|
Definition | Unordered categories | Ordered categories | Both interval and ratio |
Examples | Gender, geographic location, job category | Satisfaction ratings, income groups, ranking of preferences | Number of purchases, cholesterol level, age |
Measures of Central Tendency | Mode | Median | Median or mean |
Measures of Dispersion | None | Min/max/range | Min/max/range, Standard deviation/ variance |
Graph | Pie or bar | Bar | Histogram |