Editing Level of measurement (section)

==== Mosteller and Tukey's typology (1977) ====
Mosteller and Tukey<ref name="Mosteller"/> noted that the four levels are not exhaustive and proposed seven instead:
# Names
# Grades (ordered labels like beginner, intermediate, advanced)
# Ranks (orders with 1 being the smallest or largest, 2 the next smallest or largest, and so on)
# Counted fractions (bound by 0 and 1)
# Counts (non-negative integers)
# Amounts (non-negative real numbers)
# Balances (any real number)

For example, percentages (a variation on fractions in the Mosteller–Tukey framework) do not fit well into Stevens's framework: No transformation is fully admissible.<ref name = "Velleman and Wilkinson 1993" />