This level of measurement provides information about whether one observation is qualitatively different from another or a person is in one category or another.
Nominal
200
This level of measurement provides the same information as nominal-level measures, plus information about the relative amount of one observation compared with another.
Ordinal
300
This level of measurement provides the same information as ordinal-level measures, plus the adjacent intervals are equal, so it's possible to determine how much more of some characteristics is possessed by a person.
Interval
400
This level of measurement provides the same information as interval-level measures, plus they have a defined zero point that has some intrinsic meaning.