Data handling and analysis - Levels of measurement
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What are the four levels of measurements
1. Nominal 2. Ordinal 3. Interval 4. Ratio
Interval data
Data measured using units of equal interval, which are known. Interval data can go into −ve values e.g. temperature
Ratio data
Data measured using units of equal interval, which are known. Ratio data has a true zero point e.g. length and time
Ordinal data
Measurements that can be put in an order, rank or position. The intervals between each rank are unknown
Nominal data
Simple frequency headcount found in discrete categories
