| 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 |
Jesus Salcedo is an independent statistical and data-mining consultant who has been using SPSS products for more than 25 years. He has written numerous SPSS courses and trained thousands of users. Keith McCormick has been all over the world training and consulting in all things SPSS, statistics, and data mining. He now authors courses on the LinkedIn Learning platform and coaches executives on how to effectively manage their analytics teams.
