The four levels of measurement are Nominal, Ordinal, Interval, and Ratio.
Nominal - Mutually exclusive, categories, Exhaustive
Ordinal- Mutually exclusive, categories, Exhaustive and Rank ordered
Interval- Mutually exclusive, categories, Exhaustive with Rank ordered plus you can measure the distance between / numerical value. This measurement does not have a 0 point so there are no percentages or ratios.
Ratio- Mutually exclusive, categories, Exhaustive with Rank ordered. This measurement does have a 0 point indicating the absence of the variable.
Nominal - Mutually exclusive, categories, Exhaustive
Ordinal- Mutually exclusive, categories, Exhaustive and Rank ordered
Interval- Mutually exclusive, categories, Exhaustive with Rank ordered plus you can measure the distance between / numerical value. This measurement does not have a 0 point so there are no percentages or ratios.
Ratio- Mutually exclusive, categories, Exhaustive with Rank ordered. This measurement does have a 0 point indicating the absence of the variable.