In surveys they often use arbitrary numbers to code variables such as religion, ethnicity, major in college or gender. In fact, with nominal variables measurement.
Determine which of the four levels of measurement is most appropriate: The subjects in which college students major. a) Nominal b) Ordinal c) Interval d) Ratio. Missing: aviation.
63 Aerospace and aircraft (orders, parts, etc.). 112 Age data, see specific subjects. Many abstracts note . College students, major field of study.