Statistics › Section A · Sampling and data › Topic A.4
Levels of measurement
Knowing a variable's level of measurement - nominal, ordinal, interval or ratio - tells you which statistics are legal on it. This topic builds the four-level ladder and shows how to use it before touching any data.
In this topic
- Why levels of measurement matter
- Nominal scale data
- Ordinal scale data
- Interval scale data
- Ratio scale data
- Worked example: classifying four variables
- Rounding answers sensibly
- Worked example: which claims make sense?
- Common mistakes to avoid
- Key takeaways
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