Levels of Measurement

Nominal

Data in categories (discrete data)

e.g- short & tall, eye colour

Ordinal

Refers to quantities that have a natural ordering, you cannot state with certainty whether the intervals between each value are equal

e.g- ranking of favourite sports, height order, happiness rating on 1-5 scale

Interval

Data is ordinal except we can say that the intervals between each value are equally split

e.g- temperature in degrees Fahrenheit, measuring weight

Ratio

Data is interval with a natural zero point

e.g- time, degrees Kelvin