**Which data type is missing from the list below?**

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**CHARACTERISTICS OF VARIABLES**

TYPE

**Ratio data **Has a natural zero point and can take any value upwards.

Difference and ratio between any two scores is meaningful.

Continuous data.

eg. age

**Interval data** Can take any value upwards, but has no natural zero point.

Difference between any two scores is meaningful, but not their ratio.

Continuous data.

eg. dates

**Ordinal data** Indicates only rank in a series.

Differences not mathematically meaningful.

eg. age groups

**Categorical data** Datapoint is a number that represents membership of a category.

Number has no mathematical value.

eg. gender (1=male, 2=female)