| Sr | Measurement | Definition | Example |
|---|---|---|---|
| 1 | Nominal | Classifies data into names, labels or categories in which no order or ranking can be imposed. | The blood group of patients i.e A, B, AB & 0 |
| 2 | Ordinal | Classifies data into categories that can be ordered or ranked. | Students grade in examination Distinction, First Class, Second Class, Pass and Fail. |
| 3 | Interval | Ranks data, precise differences between units of measure exist, but there is no meaningful zero. | IQ scores, it makes sense to talk about someone having an IQ 20 points higher than another person, but an IQ of zero has no meaning. |
| 4 | Ratio | It has all the characteristics of the interval level, but a true zero exists. Also, true ratios exist when the same variable is measured on two different members of the population. | It makes sense to say that a 70 kg adult weights twice as much as a 35 kg child. |
